s (second)
You may encounter minutes, period, days, months, so make sure to covert them into seconds.
Ex. Convert 24 hours into seconds.
24 hours x 60minutes/1hour x 60seconds/1minutes = 86400seconds.
SI base unit for time is Second.
The second is the duration of 9 192631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.
In a system of units such as the SI, BASE UNITS are defined; other units are derived from those.For example, in the SI, the meter, the kilogram, and the second are base units; the units for area (meters squared), for speed and velocity (meters/second), etc. are derived from the base units. Which units are base units, and which units are derived units, really depends on how the unit is defined. For example, in the SI, pressure is a derived unit; but you can just as well invent a system in which pressure is a base unit, and some other units, that are base units in the SI, are derived in this new system.
Time . . . SecondMass . . . KilogramLength . . . Meter
The base units of the SI system (Systeme International, as it's known in French) are kilograms (mass), meters (length/distance), and seconds (time).Because of this, the SI system is sometimes called the kg-m-s system. There are many others, but their use has become deprecated over the past 100 years or so.Believe it or not, all other SI units are based on these three units. Even seemingly unrelated units like Volts.Good luck.
"si" stands for the International System of Units, which is the modern form of the metric system. It is based on seven base units, one of which is the meter for length.
The unit for force, the newton (N), is a derived unit in the International System of Units (SI). It is derived from the base units of mass, length, and time.
The principal SI units used to derive all other SI units are the base SI units. These are the units for physical quantities such as length, time, mass, electric current, temperature, amount of substance, and luminous intensity.
For length Meter and for time Second.
There are 7 base SI units and all other are defined using these 7 base units. See the related question below:[http://wiki.answers.com/Q/What_are_all_the_SI_unitsWhat are all SI units?]
In a system of units such as the SI, BASE UNITS are defined; other units are derived from those.For example, in the SI, the meter, the kilogram, and the second are base units; the units for area (meters squared), for speed and velocity (meters/second), etc. are derived from the base units. Which units are base units, and which units are derived units, really depends on how the unit is defined. For example, in the SI, pressure is a derived unit; but you can just as well invent a system in which pressure is a base unit, and some other units, that are base units in the SI, are derived in this new system.
Seven metric base units make up the foundation of SI. And Specific combinations of SI base units yield derived units. That's why the differ.
There are 7 base SI units and all other are defined using these 7 base units. See the related question below:[http://wiki.answers.com/Q/What_are_all_the_SI_unitsWhat are all SI units?]
Time . . . SecondMass . . . KilogramLength . . . Meter
The International System of Units (SI) is based on seven base units: the meter for length, kilogram for mass, second for time, ampere for electric current, kelvin for temperature, mole for amount of substance, and candela for luminous intensity. These base units are used to derive other units for quantities such as area, volume, and velocity.
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In the SI, it is DEFINED as a base unit, together with the unit of length, the unit of time, and a few others. Other units are derived from these base units.
A Joule in SI base units is: 1 kg · m2/s2
The International System of Units (SI) consists of seven base units: kilogram (mass), meter (length), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity). These base units form the foundation for all other units in the system.