Think critically vibrations cause sounds yet if you move your hand back and forth you don’t hear a sound

You can not move your hand fast enough, the lowest frequency sound is about 20 cycles per second, if you could move your hand that fast, you might hear sound.

Love, grace-

Moving your hand back and forth does not go fast enough to move the air particles fast enough to cause sound waves.

B) raising the temperature and reducing the volume of the gas.|-/ 

The radiation of the fire causes the saucepan to heat up. the conduction of the saucepan then to distribute the heat over the saucepan and to give heat to the water. the convection of the water distributing the heat within the water, till all the water is boiling