volume in units of gallons, liters, cubic feet, cubic meters etc
I would use the metric unit is inches
I would use a postal scale to weigh the letter. Once I knew the weight, I could express it in any unit of force, but 'grams' would probably result in the most convenient number.
Feet, Yards,Miles Centimetres, metres, kilometres Light years
Use fraction to express a number less than one
You would use meters.
You would use meters.
The centimetre.
Kilograms.
Kiloliters or gallons depending on sizeo f the pool.
Cubic centimeters.
You would use a scale or a balance. You would then use a unit of mass such as milligrams or grams to express the answer.
Meters.
You would use cubic meters or cubic feet to measure the volume of a swimming pool. This unit accounts for the three-dimensional space that the pool occupies.
pounds or kilograms or tons.
You would use the cubic meter (m^3) to express the volume of a textbook in SI units.
Feet and inches or metres and centimetres.