Why do welders have to wear a protective shield to cover their eyes?​

To protect their eyes of course

Explanation:

If they dont protect their eyes and if something gets into their eyes, they could even be at risk of losing their eyesight, and other problems could occur so its very important that they protect themselves

Protects from radiation, flying particles, debris, sparks, intense light, irritation and chemical burns

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

one centimetre is equal to 0.01 metres