First slide

Thermal expansion

Question

If $γ_{g} < γ_{R}$ and $γ_{g}$ is $' + V e'$ then $(h e r e γ_{g} i s c o e f f i c i e n t o f v o l u m e e x p a n s i o n o f g l a s s; γ_{R} i s c o e f f i c i e n t o f R e a l e x p a n s i o n o f l i q u i d)$

Easy

A

liquid level falls
B

liquid level constant
C

liquid level raises
D

None

Solution

when liquid in a container is heated, container expands initially, hence liquid level falls, then liquid expands, finally liquid level in container raises
$γ_{r} = γ_{a} + γ \Rightarrow γ_{a} = γ_{r} - γ_{g} = + i v e a s γ_{r} > γ_{g}$
$∴ L i q u i d l e v e l r i s e s$

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