Question

How can we hold bottom of the test tube in hand, when uppermost layer of water in test tube is boiling?

Answer 1

the bottom of the test tube is held by our fingers and it is tilted at an angle so that the flame comes in contact with the upper part of the test tube.

Explanation:

• the ideal method of holding a test tube is by the use of a test tube holder. The whole the test tube holder is placed at the middle of the test tube. Then it is tilted so that the upper part of the test tube gets the heat from the flame.

• Due to the less density of the heated water it always rise at the top and does not settle at the bottom so that no heat is imported to the glass at the bottom of the test tube.

To know more about test tube holder,

what is test tube and test tube holder - Brainly.in

https://brainly.in/question/4348834