The answer will depend on the object that you wish to measure. For example, a balance and some standard masses (wrongly called weights) will be OK for measuring the mass of a few apples but not much use for the mass of an elephant and totally useless for the mass of the sun! In the latter case, the tools are spectroscopy and computers, with physics and mathematics as intellectual tools.
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The tool that is commonly used with the base units of mass, volume, and length is a measuring instrument or scale. For mass, a balance or scale is used to measure the amount of matter in an object. For volume, a graduated cylinder or measuring cup is typically used to measure the amount of space occupied by a liquid or solid. For length, a ruler or measuring tape is commonly used to measure the distance or size of an object.
Mass: kilogram Length: meter Volume: cubic meter (this is not a base unit, since it is derived from the meter)
Unit of length is m and that of mass is kg Now volume is length x length x lenght. SO volume would have the unit mxmxm = m3 Density = mass / volume So unit for density = kg /m3
The units for the volume if you are measuring any liquid or solid is metre^3/cm^3 as density = mass/volume. The units for mass is grams
The unit of length is metre(m), unit of volume is centimetre cube(c.c), unit of mass is kilogram(kg).
Length in metric units is usually in meters, centimeters, millimeters, and kilometers but there are other possible metric units of length. Volume in metric units is usually in liters, cubic centimeters or cubic meters but there are other possible metric units of volume. Mass in metric units is usually in kilograms, grams, or metric tons - although there are other possible metric units of mass.