1. When you light a matchstick, the heat of its burning end
does not travel to the other end held between your fingers
Why is this?
Answers
Explanation:
Although it looks like the wood of the matchstick is burning, this isn't the case. Combustion is a gas phase reaction, and what actually happens is that the heat of the flame heats the wood and decomposes it so it gives off various flammable gases. These then react with oxygen to give the flame.
So sustaining a flame requires that the burning material be heated enough to decompose or vapourise. For example the reason a match goes out when you blow on it is because your breath cools the wood and prevents it decomposing.
When you hold a match upwards the flame travels up away from the unburnt wood, so the wood is not heated as much as with the match held horizontally. Depending on exactly how the match is designed the heating of the unburnt wood may be insufficient and the match will go out. You'll find a sufficiently thick match will continue to burn because it does generate enough heat, while a thin match with a correspondingly small flame will go out
Answer:
Although it looks like the wood of the matchstick is burning, this isn't the case. Combustion is a gas phase reaction, and what actually happens is that the heat of the flame heats the wood and decomposes it so it gives off various flammable gases. These then react with oxygen to give the flame.
So sustaining a flame requires that the burning material be heated enough to decompose or vapourise. For example the reason a match goes out when you blow on it is because your breath cools the wood and prevents it decomposing.
When you hold a match upwards the flame travels up away from the unburnt wood, so the wood is not heated as much as with the match held horizontally. Depending on exactly how the match is designed the heating of the unburnt wood may be insufficient and the match will go out. You'll find a sufficiently thick match will continue to burn because it does generate enough heat, while a thin match with a correspondingly small flame will go out.
Explanation:
hope this will be helpful to you!!