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प्रश्न
What is meant by global warming?
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उत्तर
Global warming means the increase in the average effective temperature of Earth’s surface due to an increase in the amount of greenhouse gases in its atmosphere.
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संबंधित प्रश्न
Why do bottled soft drinks get cooled, more quickly by the ice cubes than by the iced water, both at 0℃?
What impact will global warming have on the health of the affected population?
How will you prove experimentally that different substances have different specific heat capacities?
An electric immersion heater is rated 1250 W. Calculate the time in which it will heat 20 kg of water at 5°C to 65°C.
Read the passage and answer the questions based on it.
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 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 then no energy can flow from inside the box or come into the box. In this situation, we get the following principle.
Heat energy lost by the hot object = Heat energy gained by the cold object. This is called the ‘Principle of heat exchange’.
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- Measuring the property of which substance this principle is used?
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