Question

In an experimental set up to measure the volume of expelled air, air is blown at one end and water is displaced from another end of the tube. Why is water displaced from the other end?

• A. Because the air sent through one tube is converted to water due to some chemical reaction
• B. Because the air blown inside displaces the same volume of water from the conical flask
• C. Because exhaled air contains more amount of water vapor
• D. All of the above

Answer 1

Answer: (B)

Because the air blown inside displaces the same volume of water from the conical flask

The air displaces water in order to locate itself inside the flask as it makes space for itself the water molecules feel some pressure exerted by air molecules and pushed outside and space which is empty is occupied by air molecules.

So the correct option is 'Because the air blown inside displaces the same volume of water from the conical flask'.