Does the flame of a candle have weight? I mean it occupies space, so it should weigh something at least, right

Question

And if it does, then how is it measured?

Answer 1

Flame is the extreme form of evolved energy from a chemical reaction.And energy doesn't have any weight or mass.

Answer 2

A flame consists of gases, liquids and solids participating (or not) in a chemical reaction. The fact that they're reacting doesn't affect their mass. So they have weight = m*g, a downward force. Like any object in air, they also displace a certain volume of air and thus experience an upward buoyant force equal to equal to the weight of that amount of air. The algebraic sum of buoyancy and weight (pos or neg) determines whether the flame materials go up or down. Because of the high flame temperature, the buoyant force exceeds the weight (in all cases as far as I know) and the flame materials travel upward.
To measure the weight I think you'd have to capture the whole flame, in an instant of time, into a syringe-like container of known weight. This would be tricky since you don't want to suck in any air that isn't part of the flame. Since the syringe changes volume you have to weigh it (before and after) in a vacuum.
Another way would be indirect and based on observation and estimation. First estimate the "residence time" tr of the flame (length/average velocity). Then measure the time dm/dt to burn a known mass of the fuel with the same flame. The mass of fuel involved in the flame mf = tr * dm/dt. To get the mass of the flame you have to estimate mw(fl) / mw(fu), the average molecular weight of the flame materials compared to that of the fuel alone. Then the flame mass would be mf * mw(fl) / mw(fu).

Answer 3

A flame is burning gas, so its weight is the weight of the gas. In a candle flame the gas is wax vapor. An example of burning without gas and therefore without flame is the burning of charcoal. It glows red but with no flame.

Answer 4

in order to understand this u hav to understand that fire as such is colourless. the colour of d flame is characteristic of d fuel being burnt or due to presence of impurities. when u burn LPG the actual colour is blue but sometimes appears yellow due to impurities d burner. depending on the chemical properties of the impurity ,it imparts a colour to d flame

so d weight of the flame wud be equal to ths sum of the fuel being burnt + the impurities in d flame.

Answer 5

That flame is the result of air molculas changing color because the heat around them is so much their color changes from red (min energy) to violet(max energy)

Answer 6

yea', but not very much, try E=mc^2