SI is a unit of measuring.
the si system of units
It was recognised that there needed to be an internationally common scientific measurement system and the international scientific community concensus was that it should be the SI system.
It means something outside scientific measurements. So, it cannot include SI units. For example, it can include the time and etc.
A kilogram is the base unit for mass in the SI system.
There are several, collectively known as the SI units.
A gram is a scientific measurement, recognized by Systeme International, as 1/1000 of the SI standard unit for mass, the kilogram.
In SI units, temperature is measured in Kelvin (K), and when people record the "heat" (such as how warm a room is, etc.) they usually mean temperature. If you mean heat in the strict scientific sense, you're talking about a transfer of energy, and energy has SI units of Joules.
A kilometre is a measurement in the SI system.
According to the International System of Units (SI), Kelvin (K) is the base unit of thermodynamic temperature measurement.
Since a kilometre is an SI unit of measurement, the answer is 64 km.
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the si system of measurement is the standard set of units accepted throughout the world.