Weather describes the conditions in the atmosphere. The temperature is the measure of how hot or cold is the air, sometimes called air temperature. Humidity is the measurement of water vapor, or the invisible water in the air. Air pressure is the weight of the atmosphere pressing down on the Earth. Air pressure is also called atmospheric pressure. The rotation of the Earth does have an effect on the direction of the wind.
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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.