If heat is exchanged between a hot and cold object, the temperature of
the cold object goes on increasing due to gain of energy and the
temperature of the hot object goes on decreasing due to loss of energy.
The change in temperature continues till the temperatures of both the
objects attain the same value. In this process, the cold object gains
heat energy and the hot object loses heat energy. If the system of both
the objects is isolated from the environment by keeping it inside a
heat resistant box (meaning that the energy exchange takes place
between the two objects only), then no energy can flow from inside
the box or come into the box.
a) Heat is transferred from where to where?
b) Which principle do we learn from this process?
c) State the principle briefly.
d) Which property of the substance is measured using this
principle?
Answers
Answer:
Aa) Thermal energy is transferred from hot places to cold places by convection. Convection occurs when warmer areas of a liquid or gas rise to cooler areas in the liquid or gas. Cooler liquid or gas then takes the place of the warmer areas which have risen higher.
Ba) (i) Heat is transferred from the object at higher temperature to the object at lower temperature. (ii) We learn the principle of heat exchange from this process.
ca) Principle of heat exchange states that the heat energy lost by hot object is always equal to heat gained by cold object provided that the system of both the objects is isolated.
da) With irregular solids, you can measure the volume by using something called the Archimedes Principle, which states that the volume of a solid is equal to the volume of water it displaces.
Explanation:
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