Short Answer TypePressure is determined as force per unit area of the surface. The SI unit of pressure, pascal is as shown below:
1 Pa = 1N m–2
If mass of air at sea level is 1034 g cm–2, calculate the pressure in pascal.
Express each of the following in SI units:
93 million miles (this is the distance between the earth and the sun)
Express each of the following in SI units:
5 feet 2 inches (the average height of an Indian female).
Long Answer TypeDefine matter. Briefly describe the physical classification (three different stages) of matter.
Matter. Matter is defined as anything which occupies space and has mass. On the basis of physical state, it has been classified as solids, liquids and gases.
(i) Solids are rigid substances which have definite shape and possess definite volume. For example, table, book, silver, wood etc.
(ii) Liquids are those mobile substances which have no definite shape but possess definite volume. They take up the shape of the vessel in which they are put. For example, milk, water, oil, mercury etc.
(iii) Gases are those mobile substances which have no fixed shape or volume. Gases flow to assume the shape of the container. For example, nitrogen, hydrogen, carbondioxide etc.
Describe briefly the chemical classification of matter.
Or
Define the terms element, compound and mixture.
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