Heat is actually a form of energy that is being transferred from a substance at a higher temperature to another substance or substances at a lower temperature. Heat is not the same as temperature. Temperature is a measure of the energy that matter contains, or how hot or cold it is. The faster the movement of the particles in an object, the higher the temperature of the object will be. Heat energy is very useful to all living things. In fact, no life would be possible on our planet without the light and heat energy from the Sun. When we are in our homes or schools, we use heaters. These heaters heat the air right above them and eventually transfer this heat energy to rest of the air in the room.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.