The taper rate for all NPT threads is 1â16 (3â4 inch per foot) measured by the change of diameter (of the pipe thread) over distance. The angle between the taper and the center axis of the pipe is 1Â° 47'â² 24â³ (1.7899Â°). Commonly-used sizes are 1/â8, 1/â4, 3/â8, 1â/2, 3â/4, 1, 1 1â/4, 1 1â/2, and 2 inch, appearing on pipes and fittings by most U.S. suppliers.
Schematic representation of the photochemical ozone formation and destruction. Ozone is a gas found in the atmosphere consisting of three oxygen atoms: O 3. Ozone is formed in the atmosphere when energetic ultraviolet (UV) radiation dissociates molecules of oxygen, O 2, into separate oxygen atoms. Free oxygen atoms can recombine to form oxygen molecules but if a free oxygen atom collides with an oxygen molecule, it joins up, forming ozone.
  A: Ozone is an allotrope of oxygen, with three oxygen atoms in a molecule. It is a very powerful oxidizer, and absorbs UV-B and some infrared light. Ozone is unstable and decays on its own, the decay rate being a function of temperature and time. Other compounds can accelerate ozone's decay.Ozone is formed in the troposphere (where we are) by combustion and industrial processes, and by light activating combustion products. This ozone is a component of smog. Ozone is formed in the ozone layer when oxygen molecules are shattered by absorbing UV-C from the Sun.UV-C only penetrates to about the lower stratosphere (above where aircraft fly), and this is where the ozone layer is found. A: Ozone is an allotrope of oxygen, with three oxygen atoms in a molecule. It is a very powerful oxidizer, and absorbs UV-B and some infrared light. Ozone is unstable and decays on its own, the decay rate being a function of temperature and time. Other compounds can accelerate ozone's decay.