Fundamental quantities are units in physics lessons that you need to know before knowing more about physics. If there is a basic quantity there is also a derived quantity. Well these two quantities are very important in our daily life. For example, do you know the difference between walking at a speed of 2 km / h and riding a bicycle at a speed of 20 km / h.
You can of course tell the difference by calculating the difference between each speed of money you have. To calculate you need a formula that later relates to the principal amount. For more details, let’s discuss thoroughly about the principal quantity.
Meaning of Magnitude
The principal quantity is the quantity whose unit has been defined before it is finally described from other quantities. In accordance with the consensus of physicists around the world. Seven tree sizes have been set in physics. Here is the basic size
| No | Tree Size | SI unit | Abbreviation |
| 1 | Long | Meter | m |
| 2 | Pulp | Kilograms | Kg |
| 3 | Time | Second | s |
| 4 | Strong electric current | Ampere | A |
| 5 | Temperature | Kelvin | TO |
| 6 | Light intensity | Candle | Cd |
| 7 | The amount of substance | Mol | mol |
For more details, please read the next paragraph
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Long
The quantity used to measure the length of an object. The international unit of length is the meter (m) with dimensions (L). One meter can be defined as the distance traveled by light in a vacuum for 1/299,792,458 of a second.
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Pulp
A quantity used to measure the mass or material content of an object. The international unit of mass is the kilogram (kg) with dimensions (m). For a mass that has a total of one kilogram, it can also be interpreted that the mass has the mass of a metal cylinder.
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Time
A quantity that has a function to measure the time of an event or occurrence. For example, a stopwatch is used to measure how fast a runner is. The international unit of time is the second (s) with dimensions (T). One second can be defined as the time it takes for the Zayn -133 atom to move 9,192,631,770 times.
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Strong electric current
Current strength is used to measure electric current from one place to another. The international unit is Ampere (A) and has dimension [I] . One ampere can be defined as the amount of current required to move one coulomb of charge per second.
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Temperature
Temperature is used to measure the heat in an object. The international unit of temperature is the Kelvin (K). The instrument used to measure temperature is a thermometer.
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Light intensity
The quantity used to measure the brightness or not of the light falling on the object. The international unit is the candela (cd). One candela can be defined as the intensity of monochromatic radiation with a frequency of 540 x 10 12 and a radian intensity of 1/683 watts per radian.
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The amount of substance
This quantity is used to measure the number of particles present in the object. The amount of this substance has international units (SI) namely moles and dimensions (N). For one mole can be defined as the number of carbon -12
Derivative Size
Derived quantities are always associated with base quantities because derived quantities are a combination of base quantities. The number of derived quantities has a very large number. You can recognize that area is a combination of the basic quantity variables, namely length.
Density is also a combination of the quantity of mass divided by the derived quantity, namely volume. Velocity also includes a combination of the principal quantities of length divided by the principal quantities of time. Still discussing combinations of derived quantities that use base quantities. Therefore the two are interrelated.
Thus, the basic quantities along with their formulas and explanations can be used as references for learning physics for beginners. For those of you who are starting to like physics, it is also important to know the principal quantities because they are the basis for further calculations.