Question

What is the difference between vapour density and density ? Explain.

Answer 1

Hint : The density of a matter is its mass per unit volume. To explain more specifically, density is the volumetric mass density of a substance. Density is also known as the specific mass.

Complete Step By Step Answer:
The density of a material is the ratio of its mass to its volume. The weight of a certain amount of gas or vapour compared to the weight of an equivalent volume of hydrogen is known as vapour density.

Vapour Density	Density
The mass of a certain volume of a substance divided by the mass of the same volume of hydrogen is known as vapour density.	The measure of the amount of matter present in a given volume is known as density.
The vapour density can be measured in grammes or kilogrammes per cubic metre.	The density of a substance is usually measured in grammes per cubic centimetre.
Vapour Density is independent of the temperature for ideal gases.	Density is dependent on the temperature of the substance.
Pressure does not affect the Vapour density of substance.	Pressure affects the density of the substance.

Additional Information:
Natural gas is mainly made up of methane, a colourless, odourless, and lighter than air gas. As a result, once sufficiently oxygenated air is emitted in an enclosed space, it will eventually displace it from the top down. Liquefied petroleum gases like propane, on the other hand, are heavier than air and cause them to sink.

Note :
As a Styrofoam cup is less dense than a ceramic cup, the Styrofoam cup floats while the ceramic cup sinks underwater. Wood floats on the surface of water because it has a lower density than water. Since oil has a lower density than vinegar, it floats.