Recent content by Vulgar

You mostly describe bias errors, which can be removed well with calibration i think. Random errors can be caused with unexpected things, for instance wind breezes for temperature sensors, or other things. But say you have a sensor which always gives you a temperature of 0,5°C lower than the...

My question is general because I guess there is a general answer, but I don't mind talking about one type of temperature sensor, eg. an RTD sensor. Say the specification of the sensor says for accuracy +- 0,01°C. What is the cause of this (in)accuracy. Is it because of a linear fit, when really...

Hi, why does a sensor, eg a temperature sensor, have an accuracy? Is it just because of a random error, or something intrinsic to the sensor itself and is it related with the resolution?

Hi WHat do you mean by, you don't know how to model this on Aspen? Does Aspen not have all components? I think it comes down to the thermodynamic models you chose for the simulation, and any components you don't have, you can try and let Aspen figure out the thermodynamic properties with...

You should consider learning at a university the same as going to work. If you work on your classes 8 hours a day (that includes going to classes and learning by yourself), begin at 8 or 9 and stop at 17h or alike, from mon-friday, you should be fine, and there is still plenty of time to do...

I like how this guys explains moles, he starts from the ideal gas law and after 10 to 15 minutes he arrives at moles, the first 20 minutes of these lecture are about ideal gas law, avogadro's number and moles: http://www.youtube.com/watch?v=YxGHbnwqd14&feature=BF&list=SPFE3074A4CB751B2B&index=22

My reasoning was also completely different than epenguin's. I knew that at equilibrium Rf=Rr, and the expression of Keq. I just assumed that for elementary reactions kf/kr=Keq. For instance: 3A+2B-->C Rf=kf[A]a[B]b and Rr=kr[C]c When the reaction is elementary, a=3, b=2, c=1, and...

If you have an elementary reaction you can put the stoichiometric factor as an exponent in the rate law. You also have reactions where the exponents don't match the stoichiometric factors, and these aren't elementary so kf/kr is not equal to the thermodynamic equilibrium. So I think Settia's...

I don't mean to confuse chawki more, but is that graph a good representation? If they mean the size of the vector with v, can't it be C then? The size only isn't sign dependant right? Or do they mean the z-component of the velocity vector?

I think this only goes for elementary reactions though, http://en.wikipedia.org/wiki/Elementary_reaction

I think this is more of a mathematical question, try and ask the question on the math board (calculus section). It's like when you try and deduce the average speed of a car, when you know it traveled 10m in 2s, the average speed during those 2 seconds is 5m/s, and that's delta(x)/delta(t). If...

Is the internal hot air forced or natural convection? Normally you can calculate any heat exchanger problem with UATln. The area would be the inside or outside area of one tube times the amount of tubes. The choice of inside or outside surface area depends on how you calculate the heat transfer...

From google: Mathematically, Raoult’s law is expressed as y(i)P = x(i)P(i)sat for all species (i= 1, 2,...,N) where xi is the liquid phase mole fraction, yi is the vapor phase mole fraction, P(i)sat is the vapor pressure of pure component i, and P is the total pressure. In words...

I think in the very early stages, they presume that the universe expanded faster than the speed of light in the inflation theory

The PA I posted: PA = [HCO3-] + 2[C03-2] + [B(OH)4-] + [OH-] - [H+] is right though, I didn't make it myself, I got it from a book concerning CO2 in seawater. The [H+] in PA actually has a minus sign . When you start titrating with a strong acid not all the acid is used to neutralize the...