The thermal coefficient of expansion in gases is defined as γ=1/273, which relates the change in volume (ΔV) to the initial volume (V[initial]) and the change in temperature (ΔΘ) according to the formula ΔV = γ⋅V[initial]⋅ΔΘ. This value is derived from the ideal gas law and can be confirmed through experimental data that shows a linear relationship between volume and temperature at constant pressure. The extrapolated temperature of -273 Celsius corresponds to zero volume for gases, establishing the basis for the absolute temperature scale.
PREREQUISITESStudents beginning their studies in physics, particularly those interested in thermodynamics and gas behavior, as well as educators seeking to explain the principles of thermal expansion and the ideal gas law.
From the ideal gas law, what is the derivative of volume with respect to temperature at constant pressure? (Are you sure about that 237, or should it be 273?)Vittorio said:I know that the variation in a gas' volume is equal to ΔV = γ⋅V[initial]⋅ΔΘ with ΔΘ the variation in temperature and γ=1/237 the thermal coefficient of expansion in gases. Could someone please explain to me why γ=1/237 please ?
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What about my other question?Vittorio said:Yes, sorry, I meant 273. My phycs teacher told me this, but I hadn't quite understood. Thanks a lot.
Are you familiar with the ideal gas law?Vittorio said:I haven't learned about derivatives yet.
Google "Ideal Gas Law"Vittorio said:I think - a perfect gas is a gas in which there are no chemical reactions between the molecules. I'm not sure, I'm just starting to learn about gases and expansion etc.