$(a)$ Give an example where a change in physical state occurs due to a change in pressure.
$(b)$ State two factors that determine the rate of diffusion of a liquid in another liquid.

State whether the following statement is true or false:
Latent heat means the heat which can be seen easily.

What happens when you open a bottle of perfume?

The property to flow is unique to fluids. Which one of the following statements is correct?

Name the state of matter in which:
$(a)$ Layers of particles can slip and slide over one another easily.
$(b)$ Particles just move around randomly because of very weak force of attraction.

Classify the following processes into osmosis or diffusion:
$(a)$ Swelling up of a raisin on keeping in water.
$(b)$ Spreading of virus on sneezing.
$(c)$ Earthworm dying on coming in contact with common salt.
$(d)$ Shrinking of grapes kept in thick sugar syrup.
$(e)$ Preserving pickles in salt.
$(f)$ Spreading of smell of cake being baked throughout the house.
$(g)$ Aquatic animals using oxygen dissolved in water during respiration.