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2. What is meant by density of
G. Answer the following questions
1. State the phenomenon of diffusion. | 4
2. What is meant by density of a substance? Arrange the following in the decreasing order of density.
Air, Milk, Copper
3. Why
do
gases have no definite shape and fixed volume? 1.8
4. Mention three main characteristics of solids./6
5. What are porous solids? Give one example. 19​

Answer 1

The density of a substance is defined as the amount of matter contained in a given volume of the substance. ... While any units of mass and volume can be used to calculate density the most common are grams (g) and milliliters (ml). This gives density the units of grams per milliliter (g/ml).

Diffusion is a mass transfer phenomenon that causes the distribution of a chemical species to become more uniform in space as time passes. In this case, species is a chemical dissolved in a solvent or a component in a gas mixture, such as the oxygen in air.