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What is "SPF" - Definition & Explanation

(Sun Protection Factor) SPF measures the effectiveness of sunscreen on the body. the test for SPF is done by using a living organism or body to measure the length of time it takes for the skin to redden without coverage or protection.

Some other terms

Some more terms:

Results when a fiber or fabric will neither stretch or shrink. Relaxation shrinkage is when fibers, when elongated during weaving or finishing relax to their natural size after being washed....
Registered trademark of Cluett, Peabody & Co. for fabrics processed by machine so that residual shrinkage will not exceed 1% in either direction (according to the U.S.?s standard wash test...
(Dye-variant fibers) Fibers, natural, or man-made, so treated or modified in composition that their affinity for dyes becomes changed; ie, to be reserved, dye lighter, or dye darker than normal...
a) The degree of parallelism of fibres, usually as a result of a combing or attenuating action on fibre assemblies that causes the fibres to be substantially parallel to the main axis of the web or...
A broom is a cleaning tool consisting of stiff fibres attached to, and roughly parallel to, a cylindrical handle, the broomstick. In the context of witchcraft, "broomstick" is likely to refer to the...

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