For the metric (SI) system it is kilograms(kg), or grams(g), usually. Milligrams (mg) is pretty common as well. Also there is the metric ton (sometimes called tonne) which is equal to 1000 kg or 1 Mg (Megagram). Note the difference between mg and Mg!
In the imperial or customary system, there are grains, ounces (several kinds), pounds, tons.
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For measuring distance, meter is used. For measuring mass, kilogram is used. For estimating time, second is used.
Units of measurement include meters for length, grams for mass, and liters for volume. Tools for measuring objects include rulers for length, scales for mass, and beakers for volume.
A) Kilogram and D) Gram are both units used to measure mass in the metric system. The kilogram is the base unit, and the gram is a smaller unit of mass. The other options, Anagram and Pound, are not units used in the metric system for measuring mass.
Three units! There are nearly 50 units for measuring mass. And that is without any of the multitude of metric units: nanogram, microgram, milligram, gram, or intermediate measures. See the Wikipedia link.
The common units used for measuring mass are grams (g) and kilograms (kg). In some cases, mass can also be measured in metric tons or pounds.