What is Materials: Definition and 980 Discussions

A material is a substance or mixture of substances that constitutes an object. Materials can be pure or impure, living or non-living matter. Materials can be classified based on their physical and chemical properties, or on their geological origin or biological function. Materials science is the study of materials and their applications.
Raw materials can be processed in different ways to influence their properties, by purification, shaping or the introduction of other materials. New materials can be produced from raw materials by synthesis.
In industry, materials are inputs to manufacturing processes to produce products or more complex materials.

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  1. O

    What materials are compatible with different chemicals and substances?

    Hi! Does anyone know a good reference literature or internet resource regarding what materials are compatible with which acids, solvents etcetera? I'm no good at this at all. I had e.g. no idea that ammonia attacks aluminium. Are silicon and amorphous carbon attacked by anything or are they...
  2. D

    What is the energy loss per second for a wall with two different materials?

    A wall is composed of two materials. Material 1 has a thickness of 7.21 cm and a thermal conductivity of 0.1 while material 2 has a thickness of 6.57 cm and a conductivity of 1. If the temperature difference inside to outside is 25 Co and the wall has an area of 10 m2, what is the energy loss...
  3. J

    Exploring Alternative Materials for 3D Dental Scanning

    Hello, currently I work at a dental lab, we just got in a new 3D scanner that scans in models of peoples teeth so that we can build crowns for the prepped teeth. I was told that it is a IR scanner. We have to put some type of spray or powder on the models so that the camera can see them good...
  4. cronxeh

    What Materials Are Prohibited During NYSTCE Test Administration?

    http://www.nystce.nesinc.com/PDFs/NY_20042005RegBulletin.pdf :rofl:
  5. Astronuc

    ME 354 Mechanics of Materials Laboratory

    University of Washington - Mechanical Engineering Department Course Notes Chapter 1 Introduction Chapter 2 Stress, Strain and Constitutive Relations Chapter 3 Beams: Strain, Stress, Deflections Discontinuity functions Comparison of...
  6. Monique

    Making Print Plates with Copper Etching and Household Materials

    What is the best way to etch copper with house hold materials? It is for making print plates.
  7. R

    Building a Human-Powered Boat with Recyclable Materials

    does anyone know of recycleable materials (strongest and less dense than water) that can be used to build a human powered boat?
  8. S

    Engineering materials (4 a mountain bike)

    undefinedundefinedundefined wat kinda material is best 4 da forks of a mountain bike? or were can i find info? quick replies please
  9. F

    Optically active materials + Faraday Rotation

    Hello folks, I have been told that for a linearly polarised wave, the direction of rotation due to the Faraday effect (caused by a constant magnetic field) is independent of the direction of wave propagation, dependent only upon the direction of the magnetic field. Fair enough. Does this...
  10. P

    Best Common Folk Materials Slowing Light Down?

    I'm aware that an Einstein-Bose Condensate can be made to slow EM energies to slow speeds but I really don't have the $$$ nor time to make a BEC. I also wouldn't be able to get the BEC shape in any form I need either. Therefore, what materials exist that can help me slow down some photons? I...
  11. D

    What is the Allowable Load on a Tie-Down with a Bent Bar and Fiberglass Support?

    okay, I've been banging my head against a wall for a few hours. It's a bit difficult to describe but here goes... There is a rope being pulled up with force P. The bottom of this rope is tied to a bent bar. The bent bar is shaped like an upside down U with the two ends stuck in a piece of...
  12. D

    Expansion and contraction of Materials

    Hi, I was wondering why some plastics seem to shrink when heat is applied? Does the plastic expand when it is colder? Is it some how due to the molecular bonds in the material rather then the ionic bonds in something like a metal that expands when heated? Thanks Derek Mohammed
  13. Mk

    Differences Between P and N Type Materials

    What are, and the diffrences between p and n type materials?
  14. Saint

    75% of the world materials used by Americans?

    This is what I often heard about, true or not? Americans also dubbed the biggest environment destroyer and polluter
  15. S

    Just a weird idea, friction-less materials

    I just wondered, that our view of how the universe is is ussually WRONG. We've made zero-viscosity fluids, materials with no electrical resistance, and just all together "non-sense" things. Is anyone willing to suggest then that there are materials that do not provide friction(when...
  16. Saint

    Where to download lecture notes for Mechanics of Materials

    :rofl: Can anyone give me the website?
  17. Z

    What are some common thermoelectric materials and their properties?

    I wanted to do an experiment that had to deal with thermoeletric materials, and the out but of electricity. Does anyone know of a common thermoelectric material? Maybe somthing around the house? If not then just name off what you know. I want to see the output of electricity compared to the...
  18. S

    Why amorphous phase materials have wider bandgap?

    I'm wondering why the amorphous phase materials have wider bandgap compared to its crystalline phase. To my best knowledge, the bonding mechanism does not changed as the material transform from crystalline phase to amorphous phase. So what causes it has larger bandgap? ST
  19. D

    How do you build & design a bridge with these materials?

    how do you build & design a bridge with these materials? 4 drinking straws 10 pieces dressmaker's oin 5 pieces of 5-peso coins (the bridge should be able to withstand the weight of these coins) 1 short bond paper and a 1 meter sticky tape Anyone who has performed this project...
  20. D

    How do you design a bridge with these materials?

    how do you build & design a bridge with these materials? 4 drinking straws 10 pieces dressmaker's oin 5 pieces of 5-peso coins (the bridge should be able to withstand the weight of these coins) 1 short bond paper and a 1 meter sticky tape Anyone who has performed this project...
  21. E

    Unraveling the Mysteries of Atoms and Materials

    umm i got some silly question to ask , i just couldn't find a good answer by my self. 1. is my body made up with atoms, ? i don't really think so, so what's my body made of? i mean my flesh. 2. wats is a piece of material such as wood or gold, made of, ? i mean when u cut down to...
  22. Ivan Seeking

    Zero gravity produced materials

    For years I heard all sorts of promises about materials made in space. An alloy of lead and aluminum was often mentioned as a favorite. What is the state of this technology? Are things looking as good as promised?
  23. D

    Titanic: Hull Materials & Construction - Get Answers Here!

    i'd like to know about the materials that were used to build the hull of the titanic?...i'v googled it,,, but i suck at finding info so bad, can anyone help?
  24. T

    Truly new to biology, Looking for some materials

    deleted. GO
  25. Ivan Seeking

    Hagfish slime as an option to plastics and other materials?

    So thinks the researcher in the second link. http://www.aip.org/enews/physnews/2003/split/660-3.html http://www.zoology.ubc.ca/labs/biomaterials/slime.html
  26. A

    Information about laminated materials?

    Can someone give me some information about laminated materials? Is a bar of steel made of many layers, for example, stronger than one solid piece?
  27. C

    Do many asteroids contain materials useful to civilization in abundance?

    I don't know if this is the correct section or not, but I'll let hosts and mentors decide that. My question comes as a result of hearing a number of things floating around as to the possibility of mining asteroids for materiasl valuable to space colonies. Do many asteroids contain...
  28. A

    Experiments to describe the band structure of bulk (solid) materials?

    Experiments to describe the band structure of bulk (solid) materials? I just want to know the name of some of the most used techniques to describe or obtain information of how the band structure of the material is. Not by theorethical calculations, just experiments. For example, let say I...
  29. R

    Mechanics of Materials by Russell Hibbeler

    Seeing as no-one has posted any good geology books, I'll recommend some of my favourites... The Fossil Trail, Ian Tattersall - an excellent summation of Human evolution, a little bit out of date now. Trilobite, Richard Fortey - how he makes a whole book about small arthropods interesting...
  30. D

    Whats the materials specific heat capacity?

    Hello, 150kcal of heat raises the temp of 2.0kg of material by 400 degrees F. Whats the materials specific heat capacity? I cam up with 1.35 kcal/kg degrees C. is this correct? Thanks! Dx :wink:
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