This will vary from place to place, the American Red Cross only lets you donate once every 28 days. Private centers will let you donate up to twice in 7 days with at least one day in between. Thatâs how they come up with figures like âmake $300 a monthâ from donating plasma.
Within this layer, temperature increases as altitude increases (see temperature inversion) ; the top of the stratosphere has a temperature of about 270 K (â3 Â°C or 26.6 Â°F), just slightly below the freezing point of water.he stratosphere is layered in temperature because ozone (O 3) here absorbs high energy ultraviolet (UVB and UVC) radiation from the Sun and is broken down into the allotropes of atomic oxygen (O 1) and common molecular oxygen (O 2).
Above 120 miles (200 km) above sea level, temperatures in the thermosphere can vary between 600Â° and 2000Â°C (1100 and 3600Â°F). The highest temperature in the thermosphere is about 3,000o F (1500o C). However, The air in the thermosphere is thin, so not many atoms can hit a thermometre, so it wou â¦ ld have a very low reading. With nothing to shield it from the Sun's rays, the few atoms in the thermosphere get excited and move very fast.