Although there are many specialized rules for capitalizing letters, the following four are the most common.
The QA engineer has been quoted as saying, "The main source of connector failure found in the analysis is seal deformation caused by pressures in excess of 1000 psig."
Project Athena Operation Empty Space National Aeronautics and Space Administration the aircraft carrier Kittyhawk Asian-American the White Nile Mars the University of California at Santa Cruz Air Force One Dean for Undergraduate Education Director of Operations
A Handbook of Chemical Processes
Journal of the American Chemical Society
A Report to the President on the Explosion of the Space Shuttle Challenger [published report]
"Report of the O-Ring Seal Design Team" [unpublished report]
Benefits of Caloric Restriction [section of an article]
Unless you are following a documentation style that specifies otherwise, observe the following rules for capitalizing multiple word titles and proper nouns.
The Making of the Atomic Bomb
"Learning to Write Compact C++ Code"
Each discipline has its own specific conventions for determining which terms should be capitalized. In general, scientific writing tends to minimize capitalized nouns. The following list summarizes some widely observed practices.
The sun is an ordinary star.
Venus and Earth differ significantly
in the composition of their atmospheres.
special theory of relativity
the third law of thermodynamics