A List of Different Units of Measurements

Over the years, a wide variety of measuring units came into existence. One has to note that for the same quantity, many measuring units were introduced. Measurement is a way through which any physical quantity can be described on the basis of observance. The measuring scales had to be defined very precisely in order to ensure that the measures be verified and standardized. On one side, many units fell out of use and were forgotten by the people as the technology developed. The units which were first initiated in England easily gained popularity and fame throughout the world and were used in global trade.

Units of Force and Work

Force is a significant quantity that is widely used in global trade. In general, the force can be termed as any sort of interaction which when uninterrupted will change the motions and direction of the object. Force can easily allow an object to alter its speed or acceleration. Newton is widely considered as the primary unit of force. This unit of measurement was named after the well known renowned scientist Sir Isaac Newton. Newton is the significant international metric unit of the force quantity. Remember One Newton is equal to 1-kilogram meter per second squared.

One unit of Newton determines the force that is used in accelerating the object that has a mass of 1 kilogram 1 meter per second. In real-time, Newton with many other measurements is used in several applications. Though there are many units of force, Newton is the primary metric unit. One another famous unit of force include dyne. The unit Dyne can be defined as the force that is required to provide a mass with an acceleration of 1 centimetre per second squared. One dyne would be equal to 0.00001 newtons.

In real-time, work is a very important physical quantity as it is related to our day-to-day activities. Work is the general product of force and distance. A force is commonly defined as a force that is responsible for the movement or any form of displacement of a specific object. Work can be of any form. Lifting a box, book, pushing a cart, carrying a bag, all of these are common forms of work. For a work to happen, force must be exerted on the object to move. Joule is the unit that is used in measuring the work which is indicated by J. It is the work which is expended by the force of one newton where the displacement has happened over one meter. Work can be defined as W= Fs. Here F is the force and s is the displacement happened to the object.

Determining the value of Energy, Power, and Density

In the physics world, energy can be defined as the capacity to do work. Energy can be potential, chemical, nuclear, electrical or kinetic form. Remember that all kinds of energy are very much related to the motion. A famous fact is that energy can neither be created nor be destroyed. Instead, it can only be changed from one form to another form. This renowned saying is the first law of thermodynamics. Joule is used in measuring the physical quantity, energy. The unit of energy was named after James Prescott Joule. He did extensive research and experimentation on the mechanical form of heat.

The unit Joule is a derived unit of energy. It can be taken as the energy that gets transferred to get work done on a specific object when a force of one newton acts on the object. Joule = kg.m^2/s^2. Here kg stands for kilogram, m for meter and s for a second. Whenever you try to define work, energy is often connected with that. Energy is required in order to bring a change in the motion of the object. This measure of the unit for energy, which is Joule is standardized and used in all global scenarios all over the world.

Power is another physical quantity which is commonly used. Power is a scalar quantity as it does not have any direction. Power is the quantity of energy which is transferred per unit time. According to the Internal system of units, the system unit of power is joule per second (J/s). It is also commonly known as a watt. Watt, the unit of power is named after James watt. In the early days, the measure of power was horsepower. Later the unit, Watt came into use and became popular. Since power is the rate of work, power can be defined as power = work / time. Watt(W) equals one joule per second. Watt is very common, as it is used in specifying the rate at which the electrical energy gets radiated or dissipated.

The physical quantity called density is the mass per unit volume of any particular object. This quantity can be measured in many ways. The best way to calculate the density of the object is to divide the mass by is volume. This physical quantity, Density equals m/v. Here m stands for the mass of the object while v stands for the volume. So density is to divide the mass in kg by its volume in cubic meters. The volume of any specific object can be calculated by determining the value of length * breadth * height. Unit of the physical quantity, density is kg/m^3. m^3 is the unit of volume while the unit of mass is kilogram (kg). The standardized value for the density of water is nearly 1000 kg/m^3 while the density of air is around 1.2 kg/m^3. Remember that if solids when placed in water and are found to sink, the density of that object is definitely greater than water.

Physical Quantities associated with the fluid behaviour

The pressure is the physical quantity that is associated with the fluid behaviour. The pressure is the force which is defined as force per unit area. The activity of the fluids can be noticed well with the pressure quantity than force. The standardized unit for pressure if Pascal(P). This derived unit, Pascal is equal to a newton (Force) per square meter. This unit of pressure helps in the quantification of Internal pressure, tensile strength as well as Young’s module. This unit, Pascal is named after the French person Blaise Pascal. The very common multiple units of pascal include the hectopascal and kilopascal. Kilopascal, being the more popular one equals 1000 Pa. This Kilopascal is equal to one centibar. Pascal unit is commonly involved in measuring the differences in pressure in the ventilation systems.

Another physical quantity that is associated with the fluid’s behaviour is viscosity. The physical quantity, viscosity is indicated by the Greek letter (eta). This quantity is commonly referred to as the dynamic or the simple viscosity. It is the quantity that purely describes a particular fluid’s resistance towards the liquid flow. In general, a fluid resists the motion of the object that is immersed through them. One can notice the viscosity to be zero only at extremely low temperatures present in the superfluids. In general, all the fluids are considered to have only positive viscosity meaning that a specific fluid is viscous in nature.

The unit associated with the physical quantity, viscosity is the pascal second. This is indicated as Pa s. Here Pa refers to Pascal and s refers to the second. This unit of viscosity is not used often in scientific as well as in technical writing. Instead, the highly used unit of viscosity if the dyne second per square centimetre. This can be taken as dyne s/cm^2. This unit of viscosity is provided with the name poise [P]. This name Poise was designated for the unit fo viscosity after the physiologist Jean Poiseuille. Remember that ten poise equals one Pascal second. This ensures that the units centipoise as well as millipascal second identical to each other.

Resistance (R) - Determining the opposition forces

Resistance is basically the opposition that is offered by a specific substance to the electric current flow. Resistance is indicated by the letter R. This resistance is the measure of the position to the flow of current that happens say in an electric circuit. The standardized unit of resistance is ohm that is denoted by the Greek letter omega(Ω). This unit derived its name from Georg Simon Ohm, a physicist who did a complete detailed study on the relation between voltage, current as well as the resistance. Remember that all types of materials resist the current flow to a certain extent. Based on its extent, materials are widely classified as conductors and insulators. Ohm = V/A, where V is the voltage and A is one-ampere current. This unit helps in determining the voltage, current or any resistance of a circuit provided the other two quantities are known to us.

The Systeme International d’ Unites (SI) is a system of units which are followed all over the world. People from different countries can easily communicate with one another on a global front through SI units. In addition, the units ensure that the calculations are made instantly and accurately. The most common physical quantities including work, force, energy, power, density, resistance, viscosity and density all have clearly defined units that play a role in determining the value of the quantities accurately.

Scientific Measurement & the SI System


  1. Measurements is a very important topic for secondary science students. There are different sorts of questions asked in secondary science exams that are around measurement. The list of Different Units of Measurements for length, power, temperature, work, density, and force is very useful. Many times questions asked in exams to represent one measurement unit in a different system of units representation. A system of units is a set of related units, including both the fundamental and derived units, which are used for calculations. Students required to learn well about the Units of Measurements in Physics Tuition because it will help them in various physics derivations and numerical. Thanks for sharing a helpful post.


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