Give reasons:
a.Salt and sugar kept in different jars take the shape of the jars,yet they are classified as solid.
b.Solid have negligible compressibility yet sponge can compressed.
c.Gases exert pressure on the wall of the container
a. The shape of each individual sugar or salt crystal remains fixed, wether we take it in our hand, put it in a plate or in a jar.As we know solids don't change shape. That is why they are still considered solids.
b. A sponge has minute holes, in which air is trapped, when we press it, the air is expelled out and we are able to compress it.
c. In gaseous state, the particles move about radomly at high speed. Due to this random movement, the particles hit each other and also the walls of the container. The pressure exerted by the gas is because of this force exerted by the gas particles per unit area on the walls of the container.