Which of the following units is smallest?
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Units of Distance – Definition, Units, Formula, Conversion
What is Distance?
Distance formula
A simple formula to calculate distance when speed and time are known is:
d = distance
S=speed
T = time
What are the units of Distance?
Distance is measured using units that represent length, with the most common being meters (m), the base unit in the International System of Units (SI). For longer distances, kilometers (km) are used, particularly in navigation and geography, while miles (mi) are preferred in the United States and the United Kingdom for road distances. Feet (ft) and inches (in) are also widely used, particularly in the United States, for smaller-scale measurements in various applications, including construction and manufacturing. Each unit serves to ensure precise communication and computation of spatial relationships in different contexts.
SI unit of distance
CGS Unit of distance
List of Units of Distance
| Unit | Symbol |
|---|---|
| Meter (m) | m |
| Kilometer (km) | km |
| Centimeter (cm) | cm |
| Millimeter (mm) | mm |
| Foot (ft) | ft |
| Inch (in) | in |
| Mile (mi) | mi |
| Yard (yd) | yd |
Meter (m): The basic unit of distance in the International System of Units (SI), equal to the distance traveled by light in a vacuum during a time interval of 1/299,792,458 of a second.
Kilometer (km): Equal to 1,000 meters, commonly used for longer distances such as road distances and geographical measurements.
Centimeter (cm): Equal to 0.01 meters, often used for shorter distances such as the length of small objects or in scientific measurements.
Millimeter (mm): Equal to 0.001 meters, commonly used for very small measurements such as the thickness of paper or precision engineering.
Foot (ft): Equal to 0.3048 meters, commonly used in the United States and other countries for everyday measurements of height and distance.
Inch (in): Equal to 0.0254 meters, commonly used for smaller measurements such as the length of small objects or in construction.
Mile (mi): Equal to 1,609.34 meters, commonly used in the United States and some other countries for longer distances such as road distances and geographical measurements.
Yard (yd): Equal to 0.9144 meters, commonly used in the United States and some other countries for shorter distances, especially in sports and construction.
Conversion of Units of Distance
| From Unit | To Unit | Conversion Formula |
|---|---|---|
| Kilometer (km) | Meter (m) | 1 km = 1000 m |
| Meter (m) | Kilometer (km) | 1 m = 0.001 km |
| Meter (m) | Centimeter (cm) | 1 m = 100 cm |
| Centimeter (cm) | Meter (m) | 1 cm = 0.01 m |
| Meter (m) | Millimeter (mm) | 1 m = 1000 mm |
| Millimeter (mm) | Meter (m) | 1 mm = 0.001 m |
| Foot (ft) | Meter (m) | 1 ft = 0.3048 m |
Kilometer to Meter
To convert kilometers to meters, multiply the number of kilometers by 1000. For example, 1 kilometer is equal to 1000 meters.
Meter to Kilometer
To convert meters to kilometers, divide the number of meters by 1000. For instance, 1000 meters is equivalent to 1 kilometer.
Meter to Centimeter
Converting meters to centimeters involves multiplying the number of meters by 100. Thus, 1 meter equals 100 centimeters.
Centimeter to Meter
To convert centimeters to meters, divide the number of centimeters by 100. Therefore, 100 centimeters is equal to 1 meter.
Meter to Millimeter
When converting meters to millimeters, multiply the number of meters by 1000. For instance, 1 meter is equivalent to 1000 millimeters.
Millimeter to Meter
To convert millimeters to meters, divide the number of millimeters by 1000. Hence, 1000 millimeters is equal to 1 meter.
Foot to Meter
Converting feet to meters involves multiplying the number of feet by 0.3048. Therefore, 1 foot is approximately equal to 0.3048 meters.
FAQ’s
What are the largest distance units?
The largest distance units include kilometer (km), mile (mi), and astronomical units (AU). These units are commonly used for vast distances such as between cities or celestial bodies.
What is the shortest measurable distance?
The shortest measurable distance is currently estimated to be the Planck length, approximately 1.616 x 10^-35 meters, according to quantum mechanics and theoretical physics.
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Practice Test
How many inches are in a foot?
10
12
14
16
of 10
How many feet are in a yard?
2
3
5
6
of 10
What is the metric equivalent of a mile?
1.6 kilometers
1.6 meters
1.6 centimeters
1.6 millimeters
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Which unit is used to measure astronomical distances?
Kilometer
Mile
Light-year
Meter
of 10
Which of the following is a unit of length in the metric system?
Inch
Foot
Meter
Yard
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How many centimeters are in a meter?
40
100
90
78
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Which unit is used to measure very small distances, like the size of bacteria?
Kilometer
Centimeter
Millimeter
Micrometer
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What is the SI unit for measuring distance?
Kilometer
Meter
Mile
Foot
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Which of the following is the longest distance?
1 kilometer
1 mile
1 meter
1 yard
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