CHEM 110 Lecture Notes - Lecture 4: Thermosphere, Substitute Good, Ammonia
Document Summary
Our atmosphere is composed of many different levels. 0 km is at sea level; 2 km is the troposphere; 20-40 km is the stratosphere, and also the ozone layer; 80 km is the mesosphere; 200 km is the thermosphere; and 1000 km is the exosphere. 0-80 km consists of the homosphere, while 80+ km is the heterosphere. Ozone has a little bit of a weaker bond and will break with wavelengths less than or equal to 320 nm. 1956, ground based measurements of stratospheric ozone began. 1978, comprehensive worldwide satellite measurements of stratospheric ozone began, and continue today. 1900s, people relied simply on iceboxes to keep their food/items cold. In the 1920s, the first refrigerants were made, using nh3 (toxic; for ice skating rinks, etc. In (cid:1005)(cid:1013)(cid:1006)(cid:1012), tho(cid:373)as midgley, jr. i(cid:374)ve(cid:374)ted ccl(cid:1007)f a(cid:374)d ccl(cid:1006)f(cid:1006), (cid:862)(cid:373)iracle co(cid:373)pou(cid:374)ds(cid:863) called freons.
