I was wondering today, why do coals get so hot when blown on? The air rushing past should be carrying heat away from them, helping them to cool down. Can anyone answer this for me?
2007-01-06 10:46:31 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Blowing air across a hot coal sends oxygen into the reaction, fueling it. Just as a fire needs oxygen to continue to burn, coal needs oxygen in order to release heat.
2007-01-06 10:48:48 · answer #1 · answered by DavidK93 7 · 2⤊ 0⤋
The air you exhale still has about 3/4 as much oxygen as the air you inhale. So when you blow on coals you expose them to more oxygen than the stagnant air. With more oxygen they burn faster, and therefore glow more brightly.
2007-01-06 11:05:30 · answer #2 · answered by Meresa 3 · 1⤊ 0⤋
the nitrogen in the air burns and makes the coals hoter the air consist of 30% nitro
2007-01-06 12:12:16 · answer #3 · answered by Anonymous · 0⤊ 0⤋
He answered it for you..If we was to indiduce a Chemical mixture of a Methane and oxyegen into the coal we could also make it burn hotter and faster also..
2007-01-06 10:59:46 · answer #4 · answered by Anonymous · 0⤊ 0⤋
because you reach more oxygen to the fire inside it.
and you know that fire need oxygen.so when you reach more oxygen to it it is easier for some part of it to get fire and become hot.so hole of the coal becomes hot.and you know that all of the oxygen in the air you are blowing didn't use with your body and there are some oxygen in it.
2007-01-06 19:34:37 · answer #5 · answered by Arash J 2 · 0⤊ 0⤋