After turning on the kettle for a few seconds a loud noise starts emitting but looking inside, the water is still. What is making the sound.
2007-07-13 01:40:18 · 3 answers · asked by alissandra v 1 in Science & Mathematics ➔ Physics
You're probably talking about that rumbling sound that precedes a roiling boil. It sounds a bit like popcorn popping, but not as loud. It happens when the metal bottom reaches the boiling point, but the water above it is still below the boiling point. Bubbles rapidly nucleate in contact with the bottom, but as they expand into the surrounding water, they cool off and shrink back to water. The implosion is so fast it creates a shock wave that reflects outward and it heard as a tiny "pop". The rumbling sound is the result of hundreds of these pops happening every second.
2007-07-13 02:51:55 · answer #1 · answered by Dr. R 7 · 0⤊ 0⤋
If the bottom of the kettle is wet when placed on the stove, trapped water turning to steam may make a loud sound. As the bottom of a kettle is heated, water inside at the bottom may reach the boiling temperature and steam bubble may nucleate on the bottom and make sound as they rapidly expand, let go and rise. (Try to see them with a flashlight?).
2007-07-13 01:51:40 · answer #2 · answered by Kes 7 · 0⤊ 0⤋
the pressure of the air forced out...its like a person whistling, their lips are compressed and they force air out causing the noise.
2007-07-13 01:49:05 · answer #3 · answered by P.Dub La Bella Morena 2 · 0⤊ 0⤋