Describe activities to show the thermal expansion of solid liquid and gas explain expansion on heating and contraction on cooling long question answer
Answers
Answer:
Explanation:
The change in temperature of a body causes expansion or contraction of that body. Most of the substances expand on heating and contract on cooling. This is called thermal expansion. It is interesting to know why the level of mercury rises with temperature, wires attached to electric poles contract or expand with change in season, etc. This all is due to thermal expansion
The change in temperature of a body causes expansion or contraction of that body. Most of the substances expand on heating and contract on cooling. This is called thermal expansion. It has been observed that bottles which are tightly sealed with a metallic lid are easily opened when the bottle is kept upside down in a hot water for some time in such a way that just the lid is immersed in water. In this way metallic lid expands and opens easily. Also the level of mercury rises in thermometer when it is put in warm water and when the thermometer is taken out the mercury level drops.
n case of gases, when balloon is partially inflated in a cool room it expands to full size when put in warm water. This all is due to thermal expansion.
So, increase in dimension of a body due to increase in temperature is thermal expansion. The expansion in length is called linear expansion. The expansion in area is called area expansion. The expansion in volume is called volume expansion. Coefficient of thermal expansion measures the fractional change in size due to small change in temperature.
Explanation:
In case of gases, when balloon is partially inflated in a cool room it expands to full size when put in warm water. This all is due to thermal expansion. So, increase in dimension of a body due to increase in temperature is thermal expansion. The expansion in length is called linear expansion.