# Standard Unit of Length | Unit Kilometre|Meter (m) and Centimetre (cm) (2023)

Let us measure the length of the table with pencil and then with a paper clip. We get different answers.

Now, measure a book with your handspan and then ask your father to measure the same book using his handspan. You may not get the same answer. Because cubit, handspan or fingers are not standard units of measuring a length.

The length of body parts varies from a person to person. Your fathers handspan is bigger than yours.

We need to use fixed measures to find the length of the objects. The standard unit of length is metre.

The length of longer objects is measured in meters. The length of shorter objects is measured in centimeters.
We write centimeter as cm and meter as m.

1 metre = 100 centimetres

1 m = 100 cm

What is the standard unit of length?

We know some non-standard units of lengthlike hand-span, cubit, etc., and also with standard units of length like meterand centimeter. We have seen a meter-rod used by a tailor. It is used tomeasure the length of a cloth. The length of a meter-rod is called meter.

Different people have different length of body parts. Therefore, we use standard units to measure length.

Standard unit for measuring length is metre (m).

We use different units to measure different objects depending on how large the length or distance is. The length of smaller objects like a pencil is measured in centimetres (cm). The length of the classroom or height of a tree are measured in metres (m). Distance between two cities is measured in kilometres (km).

Length is measured in meters and centimetres and longer distances in kilometres.

Onemeter is divided into hundred equal parts. One division of this meteris known as one centimeter. To measure the length of the postcard,notebook, etc. we use centimeters (cm).

The meter-rod is used tomeasure the length of cloth, height of a place and small distances likelength and breadth of a field, depth of a well, height of a building,etc.

(Video) Metric Units of Length | Convert mm, cm, m and km

The main standard unit of length is Meter. The short form of meter is ‘m’.

To measure the length of the saree, classroom, blackboard,etc. we use meters (m).

The 100th of a meter is called centimeter. Centimeter is the smaller standard unit of length. The short form of centimeter is ‘cm’.

We use it to measure smaller lengths, suchas length and breadth of a book, length of a pen, etc.

Two types of scales are used by thestudents in a geometry box; one scale is of 30 centimeters length and the otheris 15 centimeters long.

There are also long measuring tapes formeasuring lengths. A meter-tape is used for tailoring work and it is one and ahalf meter long. There are some long measuring tapes about 50 meters and 100meters long. Such tapes are used to measure big lengths such as length andbreadth of a field or park, etc.

We use the unit kilometer to measure very long distance such as the length of aroad, distance between two cities, etc., The unit kilometer is equal to 1000meters. In short kilometer is written as ‘km’.

To measure distance from one place to another, i.e. fromhouse to school; from school to hospital; from California to Florida, etc. Weuse kilometers (km).

Thus, we can conclude that there are threemain standard units of length, i.e., kilometer (km), meter (m) and centimeter(cm). Click here to know about the relation between the three units of length.

Standard units are also known as the SIunits, which stand for International System of Units.

We measure the length of a pencil or a book in centimeters. Height of a tree or a ladder is measured in meters.

 Length of this book is 12 cm
 Length of this pencil is 8 cm
 Height of this tree is 10 m
 Height of this building is 30 m

Questions and Answers onStandard Unit of Length:

1. Tick the best unit of measurement that you will choose to measure the length of following objects.

Floor Lamp: m

(Video) Metric Units of Length | Length Unit Conversion | Convert mm, cm, m and km | Math

Eraser: cm

Mattress: m

Battery: cm

Mobile: cm

2. Choose the best unit that you will use to measure the following objects.

(i) The length of swimming pool is measured in __________ (cm/m/km)

(ii) The distance between your house and school is measured in __________ (cm/m/km).

(iii) The length of study table is measured in __________ (cm/m/km)

(iv) The length of eraser is measured in __________ (cm/m/km).

2. (i) m

(ii) km

(iii) m

(iv) cm

● RelatedConcepts

Conversionof Standard Unit of Length

Subtractionof Length

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## FAQs

### What is the standard unit of length answer? ›

The fundamental and standard unit of measuring the length is "metre".

What is the proper unit to measure these cm m or KM? ›

The length of smaller objects like a pencil is measured in centimetres (cm). The length of the classroom or height of a tree are measured in metres (m). Distance between two cities is measured in kilometres (km). Length is measured in meters and centimetres and longer distances in kilometres.

What is an example of standard unit? ›

Some examples of measurement of length using standard units are centimeters, meters, kilometers, inches, feet, yards, etc.

What is the standard metric unit for length? ›

The basic unit of length in the metric system is the meter. All units of length in the metric system are derived from the meter. The prefix “centi-“means one hundredth. Conversion between units of length in the metric system involves moving the decimal point to the right or to the left.

What are the two standard units of length? ›

Metre and centimetre are two standard units of length.

What is the standard SI unit for length quizlet? ›

The basic unit of length in the SI system is the meter (m), The basic unit of mass in the SI system is the kilogram (kg), For solids with larger volumes, scientists use the SI unit known as the cubic meter (m3), grams per cubic centimeter (g/cm3) and grams per milliliter (g/mL), The second (s) is the SI unit used to ...

What is the difference between centimeters meters and kilometers? ›

A meter is equal to 100 centimeters. Meters can be used to measure the length of a house, or the size of a playground. A kilometer is equal to 1000 meters. When we need to get from one place to another, we measure the distance using kilometers.

What is KM m and cm? ›

In the metric system of measurement, the most common units of distance are millimeters, centimeters, meters, and kilometers.

What is centimeter meter and kilometer? ›

Converting Larger Units to Smaller Units

1 centimeter = 10 millimeters. 1 meter = 100 centimeters. 1 meter = 1,000 millimeters. 1 kilometer = 1,000 meters.

What are 3 units of standard measurement? ›

The basic units for length or distance measurements in the English system are the inch, foot, yard, and mile.

### How do you find standard units? ›

To convert to standard units, you must find how many SD the point is above the mean. The mean is −41.67, and the SD is 54.87, so the measurement -44 is (-44+ 41.67)/54.87 = -0.042 standard units.

Do you mean by standard unit? ›

A standard unit of measurement is a quantifiable language that describes the magnitude of the quantity. It helps to understand the association of the object with the measurement. Although measurement is an important part of everyday life, kids don't automatically understand the different ways to measure things.

Where is the standard unit of length? ›

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.

Why meter is standard unit of length? ›

The metre (or meter in American spelling; symbol: m) is the base unit of length in the International System of Units (SI). The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km.

What is length in measurement? ›

Length is a measure of distance. In the International System of Quantities, length is a quantity with dimension distance. In most systems of measurement a base unit for length is chosen, from which all other units are derived. In the International System of Units (SI) system the base unit for length is the metre.

What is the standard and non-standard unit of length? ›

Standard units are common units of measurement such as centimetres, grams and litres. Non-standard measurement units might include cups, cubes or sweets.

Which of these is not a standard unit? ›

Hence, foot is not a standard unit.

How many units of length are there? ›

In the metric system, length or distance is expressed in terms of kilometers (km), meters (m), decimeter (dm), centimeters (cm), millimeters (mm).

What are the standard SI units of length mass and time? ›

The SI unit of length is metre (m), the SI unit of mass is kilogram (kg), and the SI unit of time is second (s).

What are the symbols for units of length in order from largest to smallest? ›

The symbols for units of length in order from smallest to largest are a. m, cm, mm, and km.

### What are the standard SI units of length mass and time and temperature? ›

Base Units
PHYSICAL QUANTITYNAME OF UNITABBREVIATION
MassKilogramkg
LengthMeterm
TimeSeconds
TemperatureKelvinK
3 more rows
Aug 15, 2020

What is an example of a centimeter? ›

The waist size of a pair of trousers. Length of the fish caught. The radius of a car's tires. The distance between a person's eyes.

What system is the unit of measurement is centimeter? ›

In science classes, and anywhere outside of the United States, length is measured with the Metric System. The most common units that we use to measure length in the metric system are the millimeter, centimeter, meter, and kilometer.

How do you measure length in km? ›

kilometre (km), also spelled kilometer, unit of length equal to 1,000 metres and the equivalent of 0.6214 mile (see metric system).

What is cm mm m km? ›

The metric system is used to measure the length, weight or volume of an object. Length is measured in millimetres (mm), centimetres (cm), metres (m) or kilometres (km).

What does km mean in length? ›

Kilometer, or “km,” is a unit to measure length and distance. A kilometer is similar to the measuring the unit “mile,” which is also used to measure geographical distances. Many countries use kilometers as their standard unit of measuring length and distance. 1 kilometer is equal to 1000 meters.

What is an example of length measurement? ›

Some examples of standard units of length are meters, centimeters, inches, feet, yards, etc. Standard units can again be divided into two types: Imperial units and metric system units.

What are the 7 standard units? ›

The SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance), and candela (cd, luminous intensity) ...

What are all the standard units? ›

Standard customary units that would be introduced in elementary school are pounds, ounces, miles, yards, feet, inches, gallons, pints, and cups - along with equivalent metric units of measurement like grams, liters, and centimeters.

What are standards of measurement? ›

A measurement standard is the point of reference to which the testing equipment refers. A measuring device will measure the part in question and then compare this to the standard. Without the measurement standard as a reference point, the likelihood of incorrect results greatly increases.

### What is size and length? ›

size() is a method specified in java. util. Collection , which is then inherited by every data structure in the standard library. length is a field on any array (arrays are objects, you just don't see the class normally), and length() is a method on java. lang.

Is foot a standard unit of length? ›

The size of the foot varies from person to person. If footsteps of two persons are used to measure the length respectively, then the two distances may not be equal. Thus, a footstep is not a constant quantity. Hence, it cannot be used as a standard unit of length.

Why is inch a standard unit for length? ›

The length of a foot, the width of a finger, and the distance of a step were all accepted measurements. Inch: At first an inch was the width of a man's thumb. In the 14th century, King Edward II of England ruled that 1 inch equalled 3 grains of barley placed end to end lengthwise.

What are the 4 common units of length? ›

The basic units for length or distance measurements in the English system are the inch, foot, yard, and mile.

What is the first unit of length? ›

The Egyptian cubit, the Indus Valley units of length referred to above and the Mesopotamian cubit were used in the 3rd millennium BC and are the earliest known units used by ancient peoples to measure length.

What are the measurements of length? ›

Some of the commonly used units for measuring length are centimeters, millimeters, meters, inches, feet, yards, feet, etc. Some of the units to measure mass are pounds, ounces, kilograms, grams, centigrams, milligrams, etc.

Which unit is not for length? ›

Parsec is not the unit for length.

Why do we need standard unit to measure? ›

We need standard unit for measurement to make our judgement more reliable and accurate. For proper dealing, measurement should be same for everybody. Thus there should be uniformity in measurement. For the sake of uniformity we need a common set of units of measurement, which are called standard units.

What are American units of length? ›

In the US customary system of measurement, the most common units of distance are inches, feet, yards, and miles.

Is the largest standard unit of length? ›

Kilometre is a unit of length and the largest of all the other three given in the option. It is equal to one thousand meters. As it is the largest unit, it is used to measure distance between geographical places on land. Hence from the above discussion we can conclude the kilometer is the largest unit of length.

### What are the 3 common units of measurement? ›

Systems of measurement in modern use include the metric system, the imperial system, and United States customary units.

What are 4 units of measuring length that are metric? ›

In the metric system of measurement, the most common units of distance are millimeters, centimeters, meters, and kilometers.

What are the five units of length in metric system? ›

Metric Units

Length: Millimeter (mm), Decimeter (dm), Centimeter (cm), Meter (m), and Kilometer (km) are used to measure how long or wide or tall an object is.

What is the smallest length unit? ›

The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.

What is the smallest unit of length answer? ›

Hence, the smallest unit of length is fermi.

How do you find a unit of length? ›

How to use the Units of length conversion Formula?
1. 1 kilometer = (1 × 1000) meters.
2. 1 centimeter = (1 × 10) millimeters.
3. Conversely, to convert a smaller unit to a larger unit we need to divide the numerical factor. ...
4. 1 millimeter $$= \frac{1}{10}$$ centimeter.
5. 1 centimeter $$= \frac{1}{100}$$ meter.

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