Common Measurements

* 1 Feet                = 30.48 cm

* Sq.feet               = 30.48 cm * 30.48 cm = 929.0304 sq.cm

* Ground              = 2400 sq.feet

* Kuzhi                 = 145.2sq.feet

* Cent                   = 435.60 sq.feet

* Acre                   = 43560 sq.feet =300 Kuzhi = 100 Cent

Intensity of Sound and Earth quakes

* The intensity of sound is measured in a logarithmic unit called decibel (dB).

* Intensity of earthquakes are measured in Richter scale.

Earth Quake

The earthquake waves are recorded by the instrument known as the Seismograph. The Richter scale is used to measure the intensity of an earthquake. Its scale ranges from 0 to 9.

Anemometer

Anemometer is a device used for measuring wind speed. It has aluminum cups which turn on a spindle. As the wind speed increases the cups rotate faster.

Speedometer and Odometer.

Such meters can be found on the dashboard of cars, buses etc,. This meter has provision to measure both speed and distance. One of the meters has Km/h written. This is a Speedometer.

It gives the speed of the vehicle every instant in Km/h. There is another meter also which measures the total distance covered by the vehicle sin metre. This is called an Odometer.

Foot Measurement

A metre is mouch longer than a foot. Do you know how many feet make a metre?

1 metre = 3.28 feet
so, 1 m*m = 10.76 ft*ft.

Cubic Feel

How will you express volume of water stored in a dam or reservoir?

In thousand million cubic feet (tmc).

Nanometres

The size of the atoms and molecules of matter is very small, almost beyond our imagination. It is measured in nanometres.