Science Articles


IMPORTANT UNITS OF MEASUREMENTS density, electric charge, electric current, force, frequency, length, mass, measurements, power, pressure, speed, stress, temperature, time, velocity.

10 minutes, 10 kilometers, 5 days, 5 kilograms, these are the quantities everyone talks about in day-to-day life. But what is the importance of these? What if these units of measurement did not even exist? Then how would we measure our work done, how would we measure the time, how would we measure the distance to be travelled, how would we measure our weight? Imagine not being able to distinguish between centimeter and a light year, gram and pound, second and a fortnight. Seems difficult right? The units of measurement are necessary for us to rightly estimate different events in our day to day lives. Without them we won’t even have a right system to estimate and pay for services. It’s used everywhere from households to schools and factories to research laboratories, every single place.


LENGTH – A meter is the SI unit of length. A meter is defined as the distance travelled by light in one second.

MASS – A kilogram is the SI unit of mass. A kilogram is defined as the mass of 1 liter of water.

TIME – A second is the SI unit of time. A second is defined as time taken for 9192631770 oscillations of a Cesium-133 atom.

DENSITY – The SI unit of density is kilogram per cubic meter or the mass of occupied by 1 cubic meter of the object.

SPEED, VELCOITY – The SI unit of speed and velocity is meters per second.

FREQUENCY – The SI unit of frequency is Hertz. It is defined as number of oscillations completed by a moving body in 1 second.

FORCE – The SI unit of force is Newton, coined after Isaac Newton, mathematician and scientist from United Kingdom.

PRESSURE, STRESS –  The SI unit for Pressure and Stress in Pascal or Newton per meter square. It is defined as the amount of force applied on 1 square meter area of an object.

ENERGY, WORK, QUANTITY OF HEAT – A Joule is the SI unit for energy, work and heat.

POWER – Watt is the SI unit of power. It is the amount of work done by a body in one second.

ELECTRIC CHARGE, QUANTITY OF ELECTRICITY – The SI unit of electric charge is Coulomb. It is the quantity of electricity conducted by a current of one ampere in one second.

TEMPERATURE – The SI unit of temperature is Celsius.

So, unless you quote a number with the right measurement unit, it won’t make sense. The reader won’t be able to judge the context correctly.