No, an air purifying respirator will NOT save your life in an oxygen deficient atmosphere.
An air PURIFYING respirator removes bad things from air. It does not MAKE good things (like oxygen). In an oxygen deficient atmosphere, you must have a supply of oxygen. This is usually provided by an SCBA, or an air line respirator.
Underground miners have "self rescue breathers." These are a form of respirator that can make oxygen. They are very expensive, have limited uses, and work for a limited time.
The moon has no atmosphere and it is not within the Earth's atmosphere, so it never got "to the atmosphere."
The hydrosphere refers to Earth's water bodies, which are contained within the atmosphere. Water exists as liquid, solid, and vapor within the atmosphere, but the bulk of the hydrosphere, like oceans, rivers, and lakes, cannot be found above the atmosphere.
To within a milligram - none
Gravity.
it decreases
Ozone layer
by Convection
by convection
The Atmosphere
The five layers of the Earth's atmosphere are within the Earth, as part of the planet's atmosphere. These layers include the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
- Leaking Gases or Liquids - Combustion or Oxidation - Decomposing Organic Matter ...all of the above are correct (they can create a toxic atmosphere within a confined space).
Horizontal heat transfer within the atmosphere is called advection. It refers to the movement of air masses carrying heat horizontally from one location to another.