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Why is a vessel containing liquid always heated from below rather than from the sides?
Wiki User
∙ 13y ago
This is due to the type of heat transfer which takes place. In a liquid (or a fluid in general), heat is transferred by convection, in which the BOTTOM part of the liquid gets heated, becomes less dense, moves upwards and is replaced by cold and denser liquid from the top. This is why a liquid is heated from below.
By the way, water is a poor conductor of heat, which means that if heated at the top, no convection would take place and little conduction would take place meaning that the whole of the liquid would not become hot. Cold denser water would remain at the bottom and hot less dense water at the top.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoHeating the test tube just below the meniscus helps prevent bumping. Bumping is what happens when you form a pocket of vapor under a layer of liquid. The result would be the liquid splurshing (technical term) out of the tube.
If you heat it at the top, the bubbles will escape without splashing and the heat will slowly spread throughout the entire liquid. The tubes' design facilitates heat convection so there's little worry of heating the fluid unevenly.
Marwan Mohamed
A vessel is best heated from below because of the mode of heat transfer taking place. This process is called convection and the bottom part of the water will get heated. Then convection currents transfer from the bottom to the top to make the water warm.
If we heated the water from the top, no convection currents will be able to heat it because the convection current are warm and warm air goes up and cool air comes down. The top part only gets heated.
Wiki User
∙ 12y agoits because i dont know....
Wiki User
∙ 13y agoi dont know. ask your teacher
Anonymous
ag answer imo
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