What causes a CFC molecule to break down?
What causes a CFC molecule to break down?
One of the few forces that can break up CFC molecules is ultraviolet radiation. In the lower atmosphere, CFCs are protected from ultraviolet radiation by the ozone layer itself. CFC molecules thus are able to migrate intact up into the stratosphere.
What is the definition of CFC?
: any of several simple gaseous compounds that contain carbon, chlorine, fluorine, and sometimes hydrogen, that are used as refrigerants, cleaning solvents, and aerosol propellants and in the manufacture of plastic foams, and that are believed to be a major cause of stratospheric ozone depletion —abbreviation CFC.
Are CFCs flammable?
CFC (chlorofluorocarbon) is an organic compound that contains carbon, chlorine, and fluorine. A common subclass of CFC is HCFC (hydrofluorocarbon) which contains hydrogen, as well. Non-toxic and non-flammable, both gases have relatively high mass and compresses easily to a liquid.
Are all refrigerants flammable?
Refrigerants such as R410A, R407A and R404A are class 1 in their flammability, so do not show flame propagation when tested at 100 °C and 101.3 kPa in air. At the present time, it is likely that the lowest GWP products appropriate for many application end-uses will be flammable to a degree, and likely classified as 2L.
Are CFCs man made?
Many greenhouse gases occur naturally in the atmosphere, such as carbon dioxide, methane, water vapor, and nitrous oxide, while others are synthetic. Those that are man-made include the chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs) and Perfluorocarbons (PFCs), as well as sulfur hexafluoride (SF6).
Is 02 a greenhouse gas?
Naturally occurring greenhouse gases include water vapor, carbon dioxide, ozone, methane and nitrous oxide, and together create a natural greenhouse effect. The greenhouse gases have three or more atoms in their molecules. CO2, H2O, CFC all have three atoms, while O2 (Oxygen) and N2 (Nitrogen) only have two.
What is a normal carbon dioxide level in a home?
400–1,000 ppm: typical level found in occupied spaces with good air exchange. 1,000–2,000 ppm: level associated with complaints of drowsiness and poor air. 2,000–5,000 ppm: level associated with headaches, sleepiness, and stagnant, stale, stuffy air.
Do air purifiers reduce CO2?
Along with all this, air purifiers don’t help in reducing carbon dioxide levels. So in a sealed home or office with no ventilation, and a lot of people working in cramped spaces, carbon dioxide levels can rise rapidly.