When the air hole is opened completely then the flame would turn blue indicating it is very hot. If you closed it the flame will be yellow indicating that it is not as hot (also called the safety flame). So if you half opened the hole then the flame would be hot but not as hot as the blue flame, due to the air flow mixing with the gas inside.
A hot flame is obtained (but not the hottest) with a color violet-white.
To change the flame of a Bunsen burner you must open or close the air valve, usually this is done by rotating the barrel.
See the figure at thge link below.
A normal Bunsen burner has a chimney which contains gas, a collar to adjust the air hole, a air hole that will leak gas, a gas tap that provides gas to the burner and the rubber tubing leads gas to the burner.
A Bunsen burner is a device that is used to heat materials in science. It uses a flow of gas and an air hole to regulate the temperature of the flame.
It is steady.
A hot flame is obtained (but not the hottest) with a color violet-white.
The function that covers the air hole in a Bunsen burner is the collar.
The parts of a Bunsen burner has collar,base.air hole and barrel. Collar : Adjust size of air hole Base: Support Bunsen Burner Air hole: Allow air to enter air hole Barrel:To ensure the flame is adjusted to a suitable position
The air hole in a Bunsen Burner allows air to mix with the gas prior to burning so that the flame can be adjusted as desired.
A Bunsen burner flame is hottest when the air valve hole is open.
The "air-hole" of a bunsen burner allows some of the flame to escape so that the heating flame does not become too hot. A flame that is too hot can damage laboratory equipment. When the air hole is closed it is a yellow sooty flame like the fires we have at home.
When the hole of a Bunsen burner is half closed (or half open) the flame is mostly blue-violet in color throughout, with no orange/yellow apparent as it would be with the hole fully closed. When the hole is fully open, the flame divides into a pale voilet color outer part with a cone of intense blue color within.
when you light up the burner you should see that the Bunsen burners air hole is closed that is the safest flame
Flame is stronger since there is no way for the gas to escape but through the top.
The four(4) flame types of Bunsen burner is depending on flow through the throat holes (holes on the side of the Bunsen burner -- not to be confused with the needle valve for gas flow adjustment). 1) air hole closed (Safety flame used for when not in use or lighting). 2) air hole slightly open. 3) air hole half open. 4) air hole almost fully open (this is the roaring blue flame).
The parts of a Bunsen burner include: the barrel, gas hose, base, collar, air hole and gas flow valve. The Bunsen burner is a small adjustable gas burner that is mainly used in scientific laboratories.