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.
Submit. Â· just now. Report Abuse. Ultraviolet light (UV) from the sun and oxygen molecules (O2) are responsible for most of ozone (O3) production. Ozone is formed by photochemical reactions occurring in the stratosphere. These reactions primarily occur high in the atmosphere because the UV light that drives them is completely absorbed in the stratosphere. We call this type of UV light UV-C. The UV-C light carries enough energy to break apart the oxygen molecule.