Question

One of the following is a solid foam. This one is:

(a) butter (b) bread (c) shaving cream (d) ruby

Answer 1

(b) bread

Bread is solid foam.

Mixtures are called foam when liquid is present as dispersing medium and gas is a dispersed medium. For example – shaving cream, soap bubbles, etc.

The solid foam allows the gas to get dispersed in a solid medium.

Examples: 1) Bath Sponge

2)The head on a glass of beer