Explain in detail :-
working of a rain guage
working of a mercury barometer

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?

Which statement would indicate the presence of an acid