Expansivity against temperature graph

Outrageous

β = 1/T
from the equation, T increase ,β should decrease.
But refer to graph,
http://www.sciencedirect.com/science...25540809001081
Why β increase as temperature increase?
thank you.

mfb

##\beta=\frac{1}{T}## is a relation for ideal gases. MgO is not an ideal gas.

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Outrageous	Expansivity against temperature graph Tweet β = 1/T from the equation, T increase ,β should decrease. But refer to graph, http://www.sciencedirect.com/science...25540809001081 Why β increase as temperature increase? thank you.

mfb Recognitions: Homework Help Science Advisor	##\beta=\frac{1}{T}## is a relation for ideal gases. MgO is not an ideal gas.