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There are several reasons.
Measurement units evolved over time. People used different units across countries over time. Even now, you have the Imperial system that has been mostly abandoned by developed countries across the world. But USA, Burma, Liberia and a few Caribbean islands still use the Imperial system (or a variant).
Differences in scale: It would make little sense to measure the distance between two cities in metres, or the size of an ant. In the first case you would use a kilometre, in the second a millimetre.
Sometimes the way in which a physical measure is derived will affect its units. Energy can be defined as the ability to do work and so the unit is the same as the unit for work: a Joule. However, thermal energy is defined as the amount of heat required to raise the temperature of 1 gram of pure water by 1 kelvin and in 1 calorie.
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A fraction whose numerator and denominator represent the same quantity but use different units?
A unit conversion ratio
What does this definition mean A ratio of equivalent values used to express the same quantity in different units?
It could be the definition of equivalent ratios.
A fraction in which the numerator and denominator represent the same amount but are in different units?
What is a fraction in which the numerator and denominator represent the same amount but are in different units?
Is this true that conversion factor is a ratio of equivalent values used to express the same units in different quantities?
No. The same quantities in different units.
What does units agree mean?
In mathematics, two quantities are said to be in units agreement if they have the same units of measure. For example, if two quantities are both measured in meters, then they are in units agreement. If one quantity is measured in meters and the other is measured in centimeters, then they are not in units agreement.
Can you call a physical quantity large or small without specifying a standard for comparison?
The amount or size of physical quantity depends on two things " number and unit". Every physical quantity has its own standard for fixed amount which is called as unit. The same physical quantity with larger or smaller size is measured in different units. for example 1cm or 1m Therefore even if we have to measure same physical quantity with larger or smaller size of it we should have a standard for comparison.
What is a ratio of equivalent values used to express the same quantity in different units?
treu
Is it true or false that in order to convert two different units they must represent the same physical quantity?
True. Days can't be converted into gallons, no matter how hard you try.
What are the units of measure used by early people describe each?
A unit of measurement is a definite magnitude of a physical quantity, defined and adopted by convention and/or by law, that is used as a standard for measurement of the same physical quantity.[1] Any other value of the physical quantity can be expressed as a simple multiple of the unit of measurement.
A fraction whose numerator and denominator represent the same quantity but use different units?
A unit conversion ratio
Why do we have different units for same physical quantity?
There are a few reasons. Historical and cultural: different units were used at in different parts of the world at different times. Many of these "traditional" units were eventually replaced by the SI system. However, even within the SI system, there are different units which are appropriate at different orders of magnitude. For example, the metre is the standard unit for length but it is not the most sensible unit for atomic distances, nor is it appropriate for distances between cities. Furthermore, in astronomy or cosmology there are other units such as an astronomical unit (AU = average distance between the earth and sun), a light year (the distance travelled by light, through vacuum, in one year), a parsec (the distance at which a star appears to be displace by one second of arc between the two extreme positions in the earth's orbit).
Name the physical quantity which has the same value for the waves belonging to different em spectrum?
there is no need of medium to travel
What does this definition mean A ratio of equivalent values used to express the same quantity in different units?
It could be the definition of equivalent ratios.
What is the physical quantity of weight?
The physical quantity of weight is Newton (N). Weight shares the same SI unit as force. ;)
what kinematic quantity has the same units?
work and energy have same unit which is jole denoted by "J"
What is a comparison of two quantities that have different units?
First the units of the two quantities should have the same category, e.g length units, or mass units, etc. Second: to convert the unit of one quantity to the same unit of the another quantity. third: to perform the comparison.
The unit of quantity of electricity is?
In the SI standard for physics units (see NIST website,) quantities of electricity are measured in coulombs, same as the quantity of electric charge.
