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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.
Why are several units associated with the same physical quantity?
Multiple units may be associated with the same physical quantity due to historical reasons (different regions developing their own units) or different systems of measurement (metric vs imperial). In some cases, units may be related by simple conversion factors, allowing for flexibility in expressing measurements.
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
Can a quantity have units but still be dimensionless?
No. "Dimensionless" means there are NO units involved.
A fraction whose numerator and denominator represent the same quantity but use different units?
A unit conversion ratio
Is it true or false that in order to convert two different units they must represent the same physical quantity?
False. Units can be converted between different physical quantities as long as the conversion factor relates the two quantities. For example, you can convert between meters and kilometers, even though they represent different lengths.
What is the physical quantity of weight?
Weight is a measure of the gravitational force acting on an object due to its mass. It is typically measured in units such as pounds or kilograms.
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).
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.
Name the physical quantity which has the same value for the waves belonging to different em spectrum?
The physical quantity that is the same for waves belonging to different electromagnetic spectrum is the speed of light. The speed of light in a vacuum is constant and is approximately 3.00 x 10^8 meters per second.
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.
