The first man made fibre is

Rayon

Explanation:

Rayon developed for the first time in the late 19th century as a replacement for silk. Silk was expensive in those days as was an organic product made out of cocoons. Rayon was the first man-made fibre came to be known as an artificial textile material formed from cellulose obtained from plants. Rayon was a less expensive option for silk clothing and accessories.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

the answer is 0.8m.

by: nicholas