In the medical field, what is the customary code of conduct, courtesy, and manners?

Which of the following formulas represents Boyle's law?

a. V = 2P c. P1V1 = P2V2 b. V = 1/2P d. P1/P2 = V1/V2

The gold standard for quality control for PCO2 and PO2 electrodes is:

a. capnography. c. tonometry. b. polarography. d. anometry.