Units of time - century, year, month, week, day, hour, minute, second.
The units that are Obtained by combining other units is called Derived Units.
incompatible units one is measure of time the other of length.
You can't convert that. You can only convert units that measure the same type of thing - for example, units of length to units of length, units of mass to units of mass, units of time to units of time, etc.
It doesn't make sense to convert that. You can only convert units of the same kind, e.g., units of length to units of length; units of area to units of area; units of time to units of time, etc.
Density
That depends on what you are talking about. If you are talking about units of time, then it could be hours, though it could be other units of time. You could also be talking about units of some other kind entirely, that have nothing to do with time.
Mass, length, and time are considered fundamental units because they are independent and cannot be derived from other physical quantities. These three fundamental units serve as the building blocks for the International System of Units (SI) and form the basis for measuring other physical quantities.
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.
The units that are Obtained by combining other units is called Derived Units.
If this is a speed problem, use the formula: distance = speed x time. Other than that, you can't convert from units of distance to units of time.
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.
It, as with many other units of measure, is a standard to which everyone can agree.
Time is typically measured in seconds in the metric system. Other units that can be used for longer time intervals include minutes, hours, or days, but they are not part of the official SI units for time.
Fundamental unitsFundamental units, or base units, are those that cannot be decomposed into more basic units. (Note that "basic" does not mean "smaller.") Derived units, on the other hand, are those that are defined in terms of other units, which may be base units or other derived units. In the SI system, the base unit of length is the meter, the base unit of mass is the kilogram, and the base unit of time is the second. The base unit of electrical current is the ampere which is defined in terms of the force between parallel, current-carrying conductors.One of a set of unrelated units of measurement, which are arbitrarily defined and from which other units are derived. For example, in the SI system the fundamental units are the meter, kilogram, and second.
incompatible units one is measure of time the other of length.
The SI unit of time is the second. Other units of time that are often used are minute, hour, day, week, month, year, century, millenium, as well as decimal fractions of a second such as the millisecond, microsecond, or nanosecond.
Fundamental units are the basic units of measurement in a system, like length, time, mass, electric current, temperature, amount of substance, and luminous intensity. Derived units are combinations of fundamental units, like velocity (length divided by time) or force (mass multiplied by acceleration).