Effects of Heat
Effects of Heat
Effects of heat:
Heat Causes Expansion:
When we heat a substance the energy of the molecules increases, they move away a bit more hence they occupy more space. In liquids molecules move more freely than in solids, when they are heated their movements increases more than in solids. A liquid expands more than solid. Similarly, gases expand more than liquids.
Expansion in everyday life:
Temperature Rises With Heat:
As an object is heated it gains energy. The kinetic energy of the molecules increases. This increase in energy of the molecules increases the temperature of the object.
Illustration: When ice is added to water in a glass, why do we feel cold to touch the glass?
Solution: Heat flows from a hot body to cold body. Heat flows out of the glass into the ice. Thus the glass loses heat and hence we feel it cold.
Illustration: An empty bottle is closed tightly with a cork and then heated. After some time the cork shoots out from the mouth of the bottle. What could be the reason?
Solution: When the bottle is heated, the air in it also gets heated and air expands more. Hence it exerts a force on the stopper and causes it to shoot out of the bottle.
In the transmission of electricity ______________________ between poles sag during summer and become tight in winter because of expansion due to heat. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) Heat can change the state from solid to liquid and from liquid to gas. (b) Gaps are left between lengths of railway tracks to allow expansion in summers. (c) If rails are fixed tightly, leaving no space for expansion or contraction, they will bend outward in summer.
| |||
| Right Option : D | |||
| View Explanation | |||
Heat always flows _______________ . | |||
| Right Option : B | |||
| View Explanation | |||
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