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.
Heat always flows _______________ . | |||
| Right Option : B | |||
| View Explanation | |||
Heat can change the state from Solid to ______________________ . | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) Heat can burn things which is a physical change . (b) The temperature rises with heat and as an object is heated it gains energy. (c) Excessive heat kills the organisms. | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [20]
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