You can invent any number of nonstandard units, but none of them is "best". It is best to use standard units, that is, the meter.
The standard unit of length is the meter, and any multiple and submultiple such as kilometer and millimeter. Nonstandard units include foot, inch, mile, light-year, parsec, astronomical unit.
That depends what you want to measure about the room: for example its temperature, its color, etc.
Because other people may have no idea how big the non-standard unit is. If I said than my monitor was six fingers tall, how big is that? It is, of course, better to use an international standard unit such as the centimetre or metre, but some countries are still stuck with inches.
No. A centimeter is a measure of length. Any unit of measure that has a meter in it is a measure of length. For example, millimeters, meters, kilometers are all units of measure for length.
You can invent any number of nonstandard units, but none of them is "best". It is best to use standard units, that is, the meter.
no one knows it
yes
The standard unit of length is the meter, and any multiple and submultiple such as kilometer and millimeter. Nonstandard units include foot, inch, mile, light-year, parsec, astronomical unit.
If you mean how many countries have not officially completely changed to the SI units of measure there are 3. The United States, Liberia and Myanmar (Burma).
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It was used to measure the strength of a laser. In the 1960s, razor blades were pretty much similar in shape and a Gillette was a non-standard unit for measuring the strength of a laser beam. The measurement comprised the number of laser blades that a laser device could burn through.
That depends what you want to measure about the room: for example its temperature, its color, etc.
They are used to measure quantities that are not basic. Length, for example, is a basic unit, but area and volume are not so derived units will be used to measure area and volume.
unit is what you measure by for example: cm, ft, in, mm, m, yd, etc.
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Because other people may have no idea how big the non-standard unit is. If I said than my monitor was six fingers tall, how big is that? It is, of course, better to use an international standard unit such as the centimetre or metre, but some countries are still stuck with inches.