what is linear expansion
hw to find circumference of a pencil using a thread
does widening the barometer change the pressure of liquid
Lastly in ppr 6 dey always have this triangle and tell to draw hw it will appear on the screen how do we knw wat size or if inverted or upright ![Huh? ???](https://studentforums.biz/Smileys/default/huh.gif)
answer dem asap thx
Linear Expansion - (The increase of a planar dimension, measured by the linear elongation of a sample in the form of a beam which is exposed to two given temperatures)
When length of a solid (rod) is much greater than its breadth and thickness, linear expansion or expansion in length is considered.
![](http://image.tutorvista.com/content/heat/linear-expansion.gif)
Length of a rod
![](http://image.tutorvista.com/content/heat/rod-linear-expansion.gif)
Length of a rod increases on heating
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About barometer.. I think since pressure is force per unit area, it doesn't matter how wide the tube is, as long as its diameter is constant.
pz
-MaNi