heat and velocity

[Ankit Gupta]

is there any relation ship b/w heat and velocity ?

[swansont]

Directly? No. Heat is energy being transferred. Any relation to velocity is going to be highly dependent on the details of the system.

[Ankit Gupta]

like if we take burning coal or wood and then start running by holding it in hand (burning face outward ) then it start burning fast

[swansont]

like if we take burning coal or wood and then start running by holding it in hand (burning face outward ) then it start burning fast

 

You need to be way more specific than that.

[derek w]

If you run more oxygen comes in contact with the surface.

[Mellinia]

Just tried using a burning match. Hey, you can also try to do it. The fire just went out. It's just like blowing the match. Of course charcoal is different but the velocity of air is not the factor, instead, it is, as you have said, the flux of oxygen gas in contact with the flame.

[CaptainPanic]

If you start moving the match, the flame will get more blue, indicating that the combustion is more complete. Right before it goes out (because you're moving it too fast, thus cooling it down), the flame will be quite blue, which shows that there is plenty of oxygen available.

 

It's actually easier to observe this by blowing onto the match right in front of you instead of waving that match around. Make sure not to set your eyebrows on fire.

[Nehushtan]

It's actually easier to observe this by blowing onto the match right in front of you instead of waving that match around.

But won’t you be blowing carbon dioxide rather than oxygen onto the flame?

[zapatos]

You'll be blowing both.

The air we breathe in is 21% O₂ and 79% N_2,
(neglecting humidity).

The typical
composition of exhaled air is about 18% O₂, 78% N₂,
and 4.0% CO₂.

 

http://users.rowan.edu/~farrell/hohb/Respiration.htm

Edited March 31, 2013 by zapatos

[pwagen]

But won’t you be blowing carbon dioxide rather than oxygen onto the flame?

You don't exhale pure carbon dioxide. The air around us contain around 20% oxygen. Our bodies convert some of it to carbon dioxide, but our breaths still contain 14-16% oxygen (most accurate number I could find). And since you're basically "pushing" air towards the flame, it gets more oxygen.