Weight.
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weight or mass. A microgram is one millionth of a gram, whereas a milligram is one thousandth of a gram. They are commonly used to measure small quantities of substances, such as medications or chemicals.
An appropriate metric unit for the mass of an eyelash would be milligrams (mg) because eyelashes are extremely light and measure in the milligram range.
The official SI unit is the kilogram. Related units are the gram, the milligram, the microgram, and the ton (defined as 1000 kilograms).
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 most common units for measuring mass are grams (g) and kilograms (kg) in the metric system, and ounces (oz) and pounds (lb) in the imperial system. Mass can also be measured in milligrams (mg) for smaller quantities or metric tons (tonnes) for larger quantities.
a microgram is In the metric system, a microgram or microgramme is a unit of mass equal to one millionth (1×10−6) of a gram. The unit symbol is μg according to the International System of Units; the recommended symbol in the United States and United Kingdom when communicating medical information is mcg. In μg the prefix symbol for micro- is the Greek letter μ (Mu).