Cover the glass of a torch with your palm at a dark area. Switch on the torch and observe from the other side of palm. We see that the light of torch passes through the palm but not clearly. This demonstration shows that our palm shows the property of translucent when a strong beam of light passes through it.

The handles of utensils are made from wood or plastics because utensils are good conductors of heat whereas wood and plastic are bad conductors of heat. They do not allow the heat transmission through them. So, the handles of utensils are made from wood or plastics so that our hand does not burn while handling these utensils when they are hot.

Those substances which allow the transmission of heat through them are called conductors of heat. e.g. iron, steel, copper, aluminum, etc., and the substances which do not allow heat to pass through them are called poor/non-conductors of heat, e.g. wood, rubber, plastic, cotton piece, etc.

Some liquids get completely dissolved in water.
Some others do not dissolve in water and form a separate layer when kept aside for some time.

Blackboard and wooden doors are objects which are made from opaque materials.

Due to transparent nature of glass or plastic container, biscuits, sweets, etc., can be seen easily by buyers, so shopkeepers do like this.

Oxygen gas dissolves in water, i.e. oxygen gas is soluble in water. The plants and animals which live in water use the oxygen dissolved in water for respiration. Thus, oxygen gas dissolved in water is very important for the survival of animals and plants that live in water.