Current Affairs 4th Class

Measurement

Category : 4th Class

Measurement

Synopsis

In the metric system, the standard unit of length is metre. The standard unit of mass is kilogram and the standard unit of volume or capacity is litre.
A metre is divided into 100 equal parts called centimetres.

\[\mathbf{1cm =}\frac{\mathbf{1}}{\mathbf{100}}\mathbf{m = 0}\mathbf{.01m}\]

\[\mathbf{1m =100 cm}\]

\[\mathbf{1 cm = 10 mm}\]

\[\therefore \] \[\mathbf{1mm=}\frac{\mathbf{1}}{\mathbf{10}}\mathbf{cm=0}\mathbf{.1cm}\]

Materials like plywood, laminates, aluminium, tin and stainless steel are available in sheets. Their thickness is expressed in mm.
While adding or subtracting, units of the same kind must be grouped together.
The units of length we use most often are millimetre, centimetre, metre and kilometre.

\[\mathbf{10 mm = 1cm, 10 cm = 1dm, 10 dm = 1m,}\]\[\mathbf{10m = 1Dm, 10Dm = 1 Hm, 10 Hm = 1Km}\]

\[\mathbf{1000 cm = 1m}\]

\[\mathbf{1000 m = 1km}\]

\[\mathbf{1000 m = 1 km}\]

\[\therefore \]\[\mathbf{1m = }\frac{\mathbf{1}}{\mathbf{1000}}\mathbf{ km = 0}\mathbf{.001 km}\]

The mass or quantity of an object is measured in kilograms, grams and milligrams.
Large masses are measured in kilograms. 1000 grams make 1 kilogram.
Light objects or very small quantities are measured in milligrams. 1000 milligrams make a gram.

\[\mathbf{1000 mg = 1g}\]

\[\mathbf{1000 g = 1 kg}\]

\[\therefore \] \[\mathbf{1g =}\frac{\mathbf{1}}{\mathbf{1000}}\mathbf{ kg = 0}\mathbf{.001 kg}\]

The volume or quantity of a liquid is measured in the units of capacity. Smaller quantities are measured in units of millilitres.

\[\therefore \]\[\text{1 m}l\text{ = }\frac{\text{1}}{\text{1000}}\text{ }l\text{ = 0}\text{.001}l\]