The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35m across.
FIGURE 2.1 Each centimeter contains 10 millimeters. The base unit of volume in the SI system is the cubic meter (m3).
| Property being measured | length |
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| Basic SI Unit | meter (m) |
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| Derived units | kilometer (km) 1 km = 1000 m centimeter (cm) 1 cm = 0.01 m |
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| Relationship to English Unit | 1 m = 39.37 in. 1.61 km = 1 mi 2.54 cm = 1 in. |
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Units of Mass (Weight)The basic unit of mass or weight in the metric system is the gram.
The metre is defined as the length of the path travelled by light in a vacuum in 1299 792 458 of a second. 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.
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.
The SI unit of mass is the kilogram (kg). In science and technology, the weight of a body in a particular reference frame is defined as the force that gives the body an acceleration equal to the local acceleration of free fall in that reference frame.
Standard units are the units we usually use to measure the weight, length or capacity of objects.
The range of lengths in the universe is vast, best expressed in terms of orders of magnitude, also called powers of ten. A range of magnitudes of lengths is shown below. The range of a set of data is the difference between the highest and lowest values in the set.
There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).
A standard is a repeatable, harmonised, agreed and documented way of doing something. Standards contain technical specifications or other precise criteria designed to be used consistently as a rule, guideline, or definition. Any organization can establish standards for internal or external use.
The Merriam-Webster dictionary defines width as the measurement of the shortest or shorter side of an object. Similarly the dictionary defines length as the longer or longest dimension of an object . In addition it also defined length as the longer or vertical piece of a clothing.