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).
The stratosphere, mesosphere and lowest part of the thermosphere are collectively referred to as the middle atmosphere, which spans heights from approximately 10 kilometres (33,000 ft) to 100 kilometres (62 mi).n the mesosphere temperature decreases as the altitude increases. The upper boundary of the mesosphere is the mesopause, which can be the coldest naturally occurring place on Earth with temperatures below 130 K (â226 Â°F; â143 Â°C).