No, it's a scalar measurement because it has magnitude only. A vector measurement has both a magnitude and a direction.
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vector
A vector has magnitude and direction, so since it is up it is vector.
3000kg. kilograms is a measurement for mass.
You can't. Feet are a measurement of length. Kilograms are a measurement of mass.
That depends what you want to measure about the gas: its volume, mass, transparency, temperature, etc. The really isn't such a thing as a "unit of measurement of gas", there are units of measurement for mass, volume, temperature, etc., all of which can be attributes of a specific gas.