Standard Units of Measurements

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Units and Measurements

A standard unit of measurement is a perceptible medium to help everyone understand how the object is associated with measurement. Though measurement is used in daily life, it is not easy for kids to understand the different measurements. Let us learn in detail about the different types of measurement and why they are needed.

Another unit of measurement which is internationally agreed on as a decimal system of measurement is the metric system. The units are as follows

  • Length and Distance: Length is to measure for one object and distance is measured between two objects/ places 

  • Capacity: The amount that an object can hold is defined as its capacity. 

  • Weight: weight is the measure of the heaviness of the object. 

Types of Units of Measurement

There are seven base units measurements namely meter (m), kilogram (kg), second (s), ampere (a), Kelvin (K), mole (mol), and candela (cd) 

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The most common among these are kilograms, seconds, and meters. 

Why Are Standard Units Used in Measurement? 

Standard units are used in measurement for more accuracy. The measurement should be the same for all. As there needs to be uniformity in the measurement, we must have a common set of units in measurement. These are called standard units.

The standard unit is different for different quantities. 

What is a Standard Unit of Measurement? 

The standard unit of measurement is a value that is fixed and cannot be changed. It is needed to have uniformity in measurement. The measurement is measured as feet, inches, and pounds in the United States and meters, centimetres, and kilograms in the metric system. 

Standard vs Non-Standard Measurements

There are two types of measurements, namely Standard and non-Standard. 

Standard measurement units are those which are used within the measurement system such as ounces, inches, and pounds. 

The Advantages of Standard Unit Are 

  • It helps everyone to understand measurements in a set of unit systems. 

  • SI units are derived from one another without the use of conversion 

  • SI is a metric system. 

The disadvantages are that the SI unit talks only about one unit. Hence other units' importance diluted. 

Nonstandard measurement units are those which are not used like a pencil, arm, and block. 

The advantage of Nonstandard measurement is it makes measurement easier while the disadvantage is it might be tough for many to understand. 

International System of Units 

Earlier, people didn't have measuring units to calculate the standard measurement units. So, they came up with unique ways of measurement with the tools which were available to them. The foot was used as a measurement for length. 1 foot was calculated as 30 cms. 

To solve the problem of different measurements, a common system of units called the international system of units was found and accepted. This is the modern version of the metric system. Though this system is now being used in all fields including science and technology, some people, especially in the USA, refer to length as foot and inches instead of centimetres.

Apart from the seven base units of measurement, some units are calculated based on one or more base units. These units are known as derived units. 

Examples of such units are 

Power (w) watt.  : 1W= 1kg m²s–³

Frequency ( HZ) Hertz:1H=1s–¹

Advantage of SI Units

  • SI units are measured all over the world. 

  • There is only one unit for each quantity. 

  • Submultiples and multiples can be expressed as multiples of ten as it is a metric system

Measurement of Physical Quantities

A physical quantity is the property of an object that can be measured. Examples of physical quantities are the mass of a body or the length of an object. There are two types of physical quantities namely base quantities and derived quantities. 

  • Base quantities are length, mass, time, luminous intensity, temperature, current, and amount of substance

  • Derived quantities are those which are derived from other physical quantities. Ex acceleration, velocity, and force. 

SI Unit Prefixes

The SI system uses a standard system of prefixes to the basic units which makes it more relevant. 

Prefixes are used to identify the fractions Ir multiples of the basic unit. There are 20 acceptable prefixes. 

FAQs (Frequently Asked Questions)

1. Define a unit

A unit is a physical quantity that is measured in comparison to another basic unit that has been already chosen and accepted worldwide. The result of an expression is expressed by a number which is followed by a unit.

2. Give examples of derived units

Frequency and velocity are derived units. 

Frequency is derived from seconds which is a fundamental unit. Velocity is derived from the fundamental quantities, namely length and time.