$A$ wooden chair is a solid at room temperature. Give two reasons.

On converting $25\,^{\circ}C$,$38\,^{\circ}C$,and $66\,^{\circ}C$ to the Kelvin scale,the correct sequence of temperatures will be:

Which property of gas is used in supplying oxygen cylinders to hospitals?

Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. Comment.

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

Give reasons for the following:
$(i)$ $A$ gas exerts pressure on the walls of the container.
$(ii)$ $A$ gas fills the vessel in which it is kept.