A postage stamp: millimetres.
the unit of length used in measuring long objects are yards and feet and inches.
The metre.
I would expect it would be centremetres.
By unit of length and distance and conversion ,we can say that a centimeter ruler used for measuring the length,width of the objects in centimeters ,etc.
Liquid mass is measured in grams/kilograms. A liquid cannot have a length.
the unit of length used in measuring long objects are yards and feet and inches.
By unit of length and distance and conversion ,we can say that the unit used for measuring length is m,cm,km,hm,dm,etc.
The metre.
kilometer
Units of length, such as mm, are used for this.
miles
It depends on what you are measuring but feet and inches are mostly used.
which is a better estimate for length of a pencil
You would use meters for measuring length in the metric system, which is the standard unit for length. Inches are used in the imperial system for measuring length.
When I took physics my teacher always had us use meters when measuring length because that was the unit that all the equations used. If we found a length of only a few centimeters she made us change it to a decimal number with meters as the unit. (ex. 75cm = 0.75m)
I would expect it would be centremetres.
The Ancient Greek units of measurement often varied depending upon the epoch and location. The unit of length were often named after human body parts and the unit for weight was associated with currency.