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What is "Sun Protection Factor SPF" - Definition & Explanation

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:

A warp-faced piece-dyed twill fabric that has a stout texture and a higher number of threads per centimetre in the warp than in the weft. NOTE: Some drills are made with five-end satin weave and it...
Wool-like underhair of the Bactrian camel, a two-humped pack-carrying species that is lustrous and extremely soft. Because it is expensive, often used in blends with wool for coats, suits, sweaters,...
All materials emit energy by thermal radiation as a result of their temperature. The amount of energy or radiant heat reflected depends on the surface temperature. The higher the surface temperature...
Cutting fabric diagonally across the grain, causing the material to drape fluidly and elegantly across the body. Expensive due to it's inefficient use of fabric. Often used for silk or satin dresses...
a) Fabric A length of finished fabric of less than a customary unit (piece) length. b) Finishing 1. Each passage of a length of fabric through a machine, for example in jig-dyeing. 2. A joint...

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