"Thickness" is a length or distance. The SI unit for length or distance is the meter.
In order to produce a convenient number when you're talking about the thickness
of a piece of paper, you'll probably want to use one of the meter's sub-multiples,
such as the centimeter or millimeter. For tissue or 'onionskin', you might even go
to the micrometer.
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Thickness uses the same units as length. The standard SI unit for that is the meter, but the thickness of paper could be expressed in mm or in µm.
An instrument called micrometer is used to measure paper or card thickness.
A filter paper unit refers to the porosity or permeability of a specific type of filter paper. It is a measure of how easily a liquid or gas can pass through the paper while retaining particles. The unit is typically measured in terms of flow rate, which can be quantified by the volume of liquid passing through a defined area of the filter paper over a specific period of time. This measurement helps determine the efficiency and suitability of the filter paper for different filtration applications.
In typesetting, the thickness of a line is called its weight and is measured in points.
In microns
mils