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.
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When the air hole of a Bunsen burner is half open, the air-fuel mixture will be imbalanced, resulting in incomplete combustion. This can lead to a yellow, sooty flame with lower temperature compared to a fully open air hole. Adjusting the air hole to achieve the correct ratio of air to fuel is essential for a clean, blue flame with maximum heat output.
A hot flame is obtained (but not the hottest) with a color violet-white.
The movable part of a Bunsen burner is called the air hole or air vent. By adjusting the air hole, you can control the amount of oxygen mixing with the gas, which in turn affects the type of flame produced by the burner.
The nozzle hole in a Bunsen burner is typically located at the base of the burner, where the gas enters. It is usually a small opening that allows the gas to mix with air before being ignited.
To set the Bunsen burner flame for normal heating, start by opening the air hole at the bottom of the burner. Then light the burner and adjust the air hole until you achieve a stable blue flame with a light blue inner cone. This flame is ideal for general heating purposes. Adjust the flame height as needed by controlling the fuel and air mixture.
The feature that allowed the Bunsen burner to generate a hot flame is the adjustable air vent at the bottom of the burner. By controlling the amount of air entering the burner, the user can regulate the combustion process to produce a hot and clean flame for various scientific experiments and heating applications.