What is Natural: Definition and 1000 Discussions

Nature, in the broadest sense, is the natural, physical, material world or universe. "Nature" can refer to the phenomena of the physical world, and also to life in general. The study of nature is a large, if not the only, part of science. Although humans are part of nature, human activity is often understood as a separate category from other natural phenomena.The word nature is borrowed from the Old French nature and is derived from the Latin word natura, or "essential qualities, innate disposition", and in ancient times, literally meant "birth". In ancient philosophy, natura is mostly used as the Latin translation of the Greek word physis (φύσις), which originally related to the intrinsic characteristics that plants, animals, and other features of the world develop of their own accord.
The concept of nature as a whole, the physical universe, is one of several expansions of the original notion; it began with certain core applications of the word φύσις by pre-Socratic philosophers (though this word had a dynamic dimension then, especially for Heraclitus), and has steadily gained currency ever since. During the advent of modern scientific method in the last several centuries, nature became the passive reality, organized and moved by divine laws. With the Industrial revolution, nature increasingly became seen as the part of reality deprived from intentional intervention: it was hence considered as sacred by some traditions (Rousseau, American transcendentalism) or a mere decorum for divine providence or human history (Hegel, Marx). However, a vitalist vision of nature, closer to the presocratic one, got reborn at the same time, especially after Charles Darwin.Within the various uses of the word today, "nature" often refers to geology and wildlife. Nature can refer to the general realm of living plants and animals, and in some cases to the processes associated with inanimate objects—the way that particular types of things exist and change of their own accord, such as the weather and geology of the Earth. It is often taken to mean the "natural environment" or wilderness—wild animals, rocks, forest, and in general those things that have not been substantially altered by human intervention, or which persist despite human intervention. For example, manufactured objects and human interaction generally are not considered part of nature, unless qualified as, for example, "human nature" or "the whole of nature". This more traditional concept of natural things that can still be found today implies a distinction between the natural and the artificial, with the artificial being understood as that which has been brought into being by a human consciousness or a human mind. Depending on the particular context, the term "natural" might also be distinguished from the unnatural or the supernatural.

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  1. D

    I What is the range of natural photon frequencies?

    Given that electromagnetic waves transport energy via photons, what is the lowest and highest possible frequency of a photon and what physical phenomena do these relate to? It is clear that the larger the wavelength the lower the energy for a photon. so what are the limits of the wavelength?
  2. TytoAlba95

    Why are natural products considered safe over conventional chemotherapy

    Hi there. I am reading a paper and got stumped by a question: Why are traditional natural products considered safe over conventional chemotherapy drugs? "Chemotherapy is very important in cancer treatment but most of the drugs which are currently used in chemotherapy have lesser potential...
  3. N

    MHB Zero: Natural or Counting Number?

    Zero is an integer. An integer is defined as all positive and negative whole numbers and zero. Zero is also a whole number, a rational number and a real number, but it is not typically considered a natural number, nor is it an irrational number. Why is 0 not a natural or counting number?
  4. N

    MHB Determine if (27/4)/(6.75) is a whole number, natural number, integer, rational or irrational.

    Let Z = set of real numbers Determine if (27/4)/(6.75) is a whole number, natural number, integer, rational or irrational. I will divide as step 1. 27/4 = 6.75 So, 6.75 divided by 6.75 = 1. Step 2, define 1. The number 1 is whole or natural. It is also an integer and definitely a rational...
  5. sysprog

    I Can all fundamental constants be set to 1 in natural unit systems?

    This is a question arising from the discussion in another thread. It's my understanding that among systems of natural units, the Planck units system sets not only "all three of those to 1", but also does the same with the Coulomb and Boltzmann constants, leaving the elementary charge not...
  6. maistral

    A General natural boundary condition?

    Hi, I'd like to be clarified regarding the general natural/Neumann boundary condition for a PDE. 1. The natural boundary condition is generally defined as: (1) and can be expressed as, according to this resource: (2) But apparently, according to...
  7. S

    B What process allows us to 'see' lightyears of distance with the natural eye?

    Leavitt's Law allows us to determine how far stars are from us by calculating their variable magnitude of brightness. Please explain how it's possible then for us to see, with the 'natural eye', the distances from one star to another, from one point in the night sky to the opposite, that would...
  8. anemone

    MHB Solving equation in natural number

    What is the natural $y$ from $144+{{144}^{49}}+{{144}^{{{49}^{2}}}}+{{144}^{{{49}^{3}}}}+...+{{144}^{{{49}^{2018}}}}=3({{y}^{4038}}-1)$?
  9. U

    How Do You Calculate the Natural Angular Frequency of a Dual-Spring System?

    Homework Statement The suspension of a modified baby bouncer is modeled by a model spring AP with stiffness k1 and a model damper BP with damping coefficient r. The seat is tethered to the ground, and this tether is modeled by a second model spring PC with stiffness k2. The bouncer is...
  10. R

    Prove A contains all natural numbers ≥ n_0

    Homework Statement Prove that if a set A of natural numbers contains n_0 and contains k+1 whenever it contains k, then A contains all natural numbers ≥ n_0Homework EquationsThe Attempt at a Solution I'm just confused by the question, please don't answer it. Logically it makes sense that if n_0...
  11. K

    A Natural frequencies of simplified tympanic membrane model

    I am trying to anallytically determine natural frequencies ƒ of the tympanic membrane. I am using 2D sectorial annulus membrane as a simplified model of tympanic membrane according to following picture The parameters that i want to use are following: THICKNESS = 0,1 mm The natural...
  12. P

    Why was natural selection considered revolutionary?

    It's a truism that those that are better at surviving/adapting will be better at surviving. How is that in any way enlightening or new? Is there a deeper, more complex aspect to this theory that somehow escaped me? Were there people before this theory believing that those that are worse at...
  13. M

    What is the equation for decay of natural sound over time?

    Let's say you have an impulse of noise, eg. via a guitar string, or a resonant bandpass filter, and it decays naturally. If "1" is the maximum initial amplitude of sound, and "0" is no sound at all, what is the equation for decay of sound over time (x)? Is it: y = 1/c^x Or y = 1/(x+1)^c I...
  14. Alex Katko

    Calculate the natural circular frequency ωn of the system

    Homework Statement Calculate the natural circular frequency ωn of the system shown in the figure. The mass and friction of the pulleys are negligible. The diagram is attached. Homework Equations ωn = (k/m)1/2 The Attempt at a Solution I can see the total mass of the system is 3m. So in the...
  15. F

    How to calculate natural frequency of timing belt

    Hello I am designing a shaft and it will be powered via belt pulley system. The ideal RPM of the shaft is 8000 RPM. How do I calculate the natural frequency of the timing belt to ensure resonance is never met? From what I read online it has to do with belt pretension, but even then I am little...
  16. S

    Finding number of natural numbers N such that............

    Homework Statement Find the number of natural numbers n such that (n2-900)/ (n-100) is an integer.Homework EquationsThe Attempt at a Solution I have done the following: (n2-900-9100+9100)/ (n-100) or,{ (n2 - (100)2) + 9100 }/ (n-100) or, (n+100) + (9100)/(n-100) I hope you can understand this...
  17. A

    Proof of an inequality with natural numbers

    Homework Statement Prove that ##\forall n \in \mathbb{N}## $$\frac{n}{2} < 1 + \frac{1}{2} + \frac{1}{3} + \ldots + \frac{1}{2^n - 1} \leq n \text{ .}$$ Homework Equations Peano axioms and field axioms for real numbers. The Attempt at a Solution Okay so my first assumption was that this part...
  18. R

    MHB Finding Domain for Natural Log with Exponent f(x)=ln(x^2−5x)

    I just asked a similar question, but I got help for that one, and now I am stumped again. I need to find the domain for f(x) = ln(x^2-5x) What's confusing me is how to deal with the exponent. I can't think of a way to get around it.
  19. L

    Schools Pair CS/Math or another natural science with Physics?

    Generally speaking, would it be better to pair a CS/Math minor/minor or minor/major (respectively) with physics or an additional natural science major (e.g., biochem, biophysics, chemistry) with physics? I plan on going to grad school to either pursue a physics Ph.D. or a master's in...
  20. Auto-Didact

    A Natural completion of theories

    This thread is about the process of theory completion in the practice of theoretical physics, and therefore mostly directed towards practicing theoretical and mathematical physicists, but others can chime in as well. a) What exactly constitutes a natural completion of a physical theory? b) Is...
  21. Q

    I How do we justify "Natural" Units

    How is it that when using "natural" units we drop the units themselves. I understand that you can arbitrarily change the magnitude of a parameter by choosing a new unit. For example Oliver R. Smoot is exactly 1 smoot tall. However, in natural units with [c]=[h/(2π)]=1 the "smoot" part is...
  22. E

    Has natural selection stopped affecting humans?

    In the past, natural selection selected those who are the fittest to live to pass their genes, and eliminated those who are not, but now most people pass their genes, even those who don't have the best genes to live, although now not having the best genes may affect the qualify of a person's...
  23. M

    A Calculus of Variations and Natural BCs

    Hi PF! Given a functional ##J[y]##, if the first variation is $$\delta J[y] = \int_D(ay+y'')y \, dV + \int_{\partial D} (y'+by)y\,dS$$ am I correct to think that when finding stationary points of ##J[y]##, I would solve ##ay+y''=0## on ##D## subject to boundary conditions, which would either...
  24. C

    Natural Convection vertical heated flat plate

    1. I am using FEA modelling for a vertical heated flat plate and I need to compare theoretical results with the FEA s/w modelling results. I have completed the model in FEA s/w and I'm getting different values for temperatures and because I can't work out theoretical values then I do not know...
  25. T

    Natural frequency in stationary and rotating frames....

    Hi, I am trying to gain insight into using stationary vs. rotating coordinate frames for natural frequency calculations. I have seen many FE codes suggest that critical frequencies can be calculated differently in rotating and inertial frames, so i wanted to do a 1D calc to see for myself how...
  26. R

    How Natural Rubber (NR) reacts with sulfur?

    Hello My name is ron and i am a mechanical engineering in pump factory. In some project i work on, i have fluent that contains sulfur (less then 10 %). my question is how natural rubber react with sulfur? and if its currect to use natural rubber? thanks
  27. AdrianMachin

    Ambiguity in finding errors using natural logarithm method

    Homework Statement [/B] I was reviewing this stuff and although I excelled at it once, I seem to forget some of it. For example, please consider this: Homework Equations R_C=\frac {R_1R_2} {R_1+R_2} + R_3 Here's the correct formula for its error: \Delta R_C=\frac {R_1R_2} {R_1+R_2} \left[...
  28. T

    Simplifying the Natural Convection Heat Transfer Correlation

    Homework Statement An appropriate correlation for heat transfer by natural convection from a horizontal pipe to the atmosphere is Nu=0.53Gr^0.25 Pr^0.25 Where, Gr= (αp^2 d^3 (T_1-T_f )g)/μ^2 And Pr⁡〖= (C_p μ)/k〗 Show the above correlation can be simplified to h...
  29. Delta Force

    Properties of Depleted and Natural Uranium?

    Depleted uranium is often used for applications in which high density is valued, such as counterweights, tank armor, and armor-piercing ammunition. Obviously there are going to be some differences between depleted uranium (defined as having 0.3% or less U-235) and natural uranium (averaging...
  30. P

    Natural units in the Schwarzschild Metric

    Homework Statement My Teacher says that in the Schwarzschild metric he uses natural units, where he writes ##g_{rr}=1-2M/R## He says that for one neutron star ##R=5## corresponds to approx 13 KM. Homework Equations ##1l_p=1,616 \cdot 10^{-35}m## The Attempt at a Solution Unfortunately he does...
  31. L

    MHB Natural deduction (negated implication)

    The proposition ¬(P→Q) is equivalent to ¬P^Q Does someone maybe have an idea how you can prove (directly) ¬P^Q from ¬(P→Q) by means of natural deduction? I do not manage it. Thanks in advance!
  32. Jezza

    I Are Planck Units Merely a Pop-Science Fad?

    As a physics undergrad, a set of natural units is nothing strange to me, we use them all the time. Having said this, I've never used Planck units. Does any area of research use them on a typical day in the office? There also seems to be this idea that I hear from time to time, perpetuated by...
  33. alijan kk

    Understanding the Relationship Between Natural Logarithms and Their Reciprocals

    Homework Statement 1/loga(e) = loge(a) Homework EquationsThe Attempt at a Solution how they are reciprocals of each other ? is their any longer but intuative way to show this result
  34. G

    Natural selection, evolution "why are we still sick"

    Now first of all biology is not my strong subject but I am interested in it nevertheless, if my questions come off as arrogant or ignorant then pardon and please explain as I am curious.Last night before going to sleep I suddenly stumbled upon a question, the question goes somewhat like this...
  35. T

    Small skeleton in Natural History Museum in London

    I was watching documentary "David Attenborough's Natural History Museum Alive" where he hides behind the exhibit of some small humanoid skeleton What the heck is this skeleton of? I tried searching it on google but could not find any info.
  36. I

    Natural Frequency of a Foam Block?

    Hello everyone, Looking for some help on how to go about finding the natural frequency of a block of foam. The foam has a density of 0.37 lbs./ft^3 and is 48"x48"x8" (LxWxD) in size. Weight is approximately 5.4 lbs. I have been digging around the internet for quite some time with no such luck...
  37. N

    Natural Frequency of Elastic Pipe with Different Pressures

    Hi, I have a 3mm diameter flexible silicone tube with wall diameter of 0.5mm. If this tube is filled with water at different pressures, how does the internal pressure present itself during modal testing (either shaker or impact testing). The tube lies on rigid table so it is completely...
  38. Feodalherren

    First natural frequency for bending, axial and torsion modes

    Homework Statement We have a rod of length L fixed to a rigid support. At the end of the rod there is a mass, m. Assume that the rod has no mass. Find the first natural frequency for the bending, axial and torsion modes. Homework EquationsThe Attempt at a Solution So I'm reviewing some stuff...
  39. T

    MHB Logic - Natural Deduction HELP

    Hello guys, I really need help from you about natural deduction. I just can't get to solve theses problems. Can anyone give me the solutions ? I've been trying for hours... Thanks a lot ! Premise 1 : B, Premise 2 : C→(¬B∨A) Premise 3: ¬C→¬(A∨B) Conclusion : A≡C ____ Premise 1: (A∨B)∨C...
  40. EastWindBreaks

    Why am I not getting the correct natural frequency?

    Homework Statement To find the natural frequency of a uniform cantilever beam, the area moment of inertia, cross-sectional area and density are not given, everything else is given by the lab, our group got a theoretical natural frequency( it might be angular frequency) of 27.44 Hz from lab's...
  41. Q

    A How Do I Express Mass and e in Natural Units?

    Hi Everyone, I have to calculate the coefficients of the massive Higgs Lagrangian in natural units, ħ = c = 1. Do I assume firstly that, in these units the masses of the Higgs, W and Z are the usual, 125.09±0.21, 80.4, 91.2 respectively, and secondly that e has to have the value 2√(απ)...
  42. B

    Driven resonance v. natural resonance

    I am in a physics lab course and we set up the following circuit. Given that we had a 150 milliHenry capacitor and a .5 microfarad capacitor, we calculated the expected resonance frequency using the formula for the natural frequency of an LC circuit: omega = 1/ sqrt(LC). We then measured the...
  43. F

    News Looking for a name for a natural phenomenon

    There are many cyclical phenomena occurring in a nature which have a similar pattern, such as: Farting, Yawning : (Slow buildup of gas over time and then sudden discharge of the gas) earthquake Slow capacitor charging and then sudden discharge Monjolo (Water powered hammer) : Sectarion...
  44. B

    Intervals with Natural Number Endpoints

    Homework Statement Show that ##(n,n+1) \cap (k,k+1)## is empty, provided that ##n \neq k##. Homework EquationsThe Attempt at a Solution [/B] WLOG, take ##k < n##. Then ##k -n \ge 1## is some natural number. If ##x \in (n,n+1) \cap (k,k+1)##, then ##-(n+1) < -x < -n## and ##k < x < k+1##...
  45. H

    Medical Why does natural selection favor convoluted vaginas?

    While it's true that it prevents successful penetration by unwanted males, but any unsuccessful fertilization by any males, unwanted or otherwise, results in fewer offsprings. This means lower genetic fitness for convoluted vaginas. EDIT: Not in humans. But in other species in nature such as ducks.
  46. C

    I Hamiltonian as total energy for natural systems?

    Could someone please prove that the H=T+V for systems where the transformation from Cartesian to Generalized coordinates is time independent. I have read through the proofs in Taylor's classical mechanics and Goldstein's but do not understand them.
  47. S

    What is meant by natural frequency?

    An object only undergoes an oscillation when I act on it. If I push a spring, it will have a certain frequency, and if I push a different way, it will have a different one. What is meant by natural frequency? What is meant by resonance?
  48. Adrian555

    Natural basis and dual basis of a circular paraboloid

    Hi everyone!I'm trying to obtain the natural and dual basis of a circular paraboloid parametrized by: $$x = \sqrt U cos(V)$$ $$y = \sqrt U sen(V)$$ $$z = U$$ with the inverse relationship: $$V = \arctan \frac{y}{x}$$ $$U = z$$ The natural basis is: $$e_U = \frac{\partial \overrightarrow{r}}...
  49. B

    MHB Natural logs solve ln⁡((x-1)/(x-3))=2

    hi , hope someone can help as i can't get past a certain step the natural logs is the problem ln⁡((x-1)/(x-3))=2 i can get to this point here -1 = e_x^2-x-3 -1+3=x(ⅇ^2-1) 2 = x(ⅇ^2-1) 2/((ⅇ^2-1) )=x((ⅇ^2-1)/(ⅇ^2-1)) X = 2/(ⅇ^2-1) the solution i got was this x= (2/(ⅇ^2-1)) → 0.3130352855 but the...
  50. FallenApple

    Are natural numbers mental abstractions?

    Say you have an orange and a banana. You can say that they are two fruits. But this pertains to the categorization of fruit, which could be considered a mental construct of a category. You cannot say that you have two yellow objects, because you really don't. Relative to the category of color...
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