Give me Proper answer of this question- Why we heat only upper part of test tube?
Answers
Answer:
Explanation:
If you heat the test tube from the bottom, any liquid can turn into a gas. The gas will rapidly expand shooting heated liquid out of the test tube like a cannon. The heated liquid can cause great damage especially if the liquid heat another person in the eyes.
Heating the test tube at the top allows any gases formed to escape without forcing liquids on top of the gas out of the tube.
Heating the tube at an angle reduces the pressure on the heated substances again allowing the gases to escape harmless into the air.
Accidents happen even heating the test tube gently at an angle can result in heating liquid being shot out of the test tube. This is why the test tube must be pointed away from any other person and why the experimenter must always wear safety glasses.
Answer:
Heating the test tube at the top allows any gases formed to escape without forcing liquids on top of the gas out of the tube. Heating the tube at an angle reduces the pressure on the heated substances again allowing the gases to escape harmless into the air.