Question

Suggest the way of keeping drinking water cold without the expenditure of electricity

Answer 1

Answer:

The liquid can be stored coverd with a layer of vacuum like a storing it in a flaske.

Explanation:

Vacuum is an insulater of heat.

Answer 2

Answer:

We can keep water in matkas

Explanation:

Matka has pores out of which water comes on the surface....the water on the surface absorbs energy from surrounding and from water inside the matka

And hence evaporate

We know evaporation causes cooling