The best evidence for the existence and movement of particles in liquids was provided by:

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

(i) increasing pressure on hydrogen contained in a closed container

(ii) some hydrogen gas leaking out of the container

(iii) increasing the volume of the container of hydrogen gas

(iv) adding more hydrogen gas to the container without increasing the volume of the container

Out of the following, an example of matter which can be termed as fluid is:

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is:

Which of the following statement is incorrect?