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:

Comes from the Angora goat, one of oldest animals known to man, it is two-and-one-half times as strong as wool and outwears it. Come from South Afnca. Western Asia. Turkey, and California. Oregon....
A term denoting a group of materials in which the polyamide fibres are altered through the application of steam. In this way, the fibres swell up, which makes them softer, while retaining their...
Denim, in American usage since the late 18th century, denotes a rugged cotton twill textile, in which the weft passes under two (twi- "double") or more warp fibers, producing the familiar diagonal...
Trouser-like garment, worn on the lower part of the body alike by men and women. Literally, 'leg-clothing'. The payjama was worn in many cuts and shapes, much variation being seen in respect of...
The stitch variation of the rib stitch, which resembles two separate 1 x 1 ribbed fabrics that are interknitted. Plain (double knit) interlock stitch fabrics are thicker, heavier, and more stable...

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