Materials Required A thermometer A straw How to do it Take a straw and Blow through the straw. Feel the air coming out through the straw. Are you sure it is cool. Check it out. Take a thermometer. shake well to bring the level of the mercury down. Now let us begin with the experiment. Blow through the straw on the bulb containing the mercury will rise. Explanation When the air is blown from our mouth, it enters the straw which contracts the air. The contraction makes the air warer.
How to do it
Explanation