How much is 1 perm?

The concept of a perm, both in its US and metric forms, is a measure of the permeability of a material to water vapor. In the US system, a perm represents the passage of one grain of water vapor through a square foot of material in an hour, with a pressure difference of one inch of mercury.

Converting this to the metric system, a perm equates to 57.2135 nanograms of water vapor passing through a square meter of material per second, under a pressure difference of one Pascal. Understanding the metric perm requires a basic grasp of the nanogram, which is a unit of mass equal to one billionth of a gram.

To put this into perspective, consider the weight of a common US penny. A penny weighs approximately 2.5 grams, a significant amount compared to the minute quantity represented by a nanogram. This comparison highlights the sensitivity and precision required when working with such small units of measurement.

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