Question

8 What do you mean by SI units?
Give reasons:
1. The unit of pressure is a derived
2. The unit of work is a derived unit
Write SI units of the following phys
1. volume
2.
4.​

Answer 1

Answer:

1. pa (pascal)

2. work/ efficiency

3. dcm^2

Answer 2

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Answer:

SI unit is an international system of measurements that are used universally in technical and scientific research to avoid the confusion with the units. Having a standard unit system is important because it helps the entire world to understand the measurements in one set of unit system.

The pascal is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one newton per square metre. It is named after the French polymath Blaise Pascal.

The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2, or kg·m−1·s−2). Pascal is a so-called coherent derived unit in the SI with a special name and symbol.

Since energy can be measured as work, we can write energy = force x distance. Thus SI derived unit of energy has the units of newtons x meter or kg m2/s2. This unit is more commonly called a joule (J).

si unit of volume ,The SI unit of volume is the cube of the SI unit of length, and so it is the cubic metre (m3). The cubic centimetre (cm3) and cubic decimetre (dm3) are convenient units of volume which are widely used in chemistry; 1000 cm3 = 1 dm3 and 1000 dm3 = 1 m3.

volume of cube = a^3

volume of cuboid = l×b×h

volume of sphere = 4/3πr^2

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