| PP |
One of the gas laws and a bit of mathematics that divers have to put up with! It is to do with gasses in a mixture, put simply it is the pressure of one of the component gasses. eg A cylinder contains 25% oxygen, 75% nitrogen. A pressure gauge shows that the cylinder is at 4 BAR, the partial pressure of the oxygen (ppO2) is 1 BAR, the pp of the nitrogen is 3 BAR.
출처: members.aol.com/ecwdivers/AtoZ.htm
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| PPO |
A type of health care plan that gives patients a choice of using doctors and hospitals in a network and paying a copayment or using physicians and hospitals outside the network and being responsible for a paying an annual deductible and a percent of the bill for the visit.
출처: members.aol.com/bookinfo/glossary.html
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| ppb |
Units commonly used to express contamination ratios of the amount of a contaminant in water, land, or air. In water, 1 microgram (1 millionth of a gram) of a substance per liter of water is equal to one part per billion, while 1 milligram (1 thousandth of a gram) of a substance per liter of water is equal to one part per million. 1 liter of fresh water weighs approximately 1000 grams.
출처: www.epa.gov/region09/cross_pr/mtbe/charnock/defini...
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| PPD |
plans, programs division
출처: www.globalsecurity.org/military/library/policy/arm...
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| PPD |
a purified protein derivative of tuberculin injected under the skin of the arm in a tuberculosis skin test.
출처: www.sfaf.org/treatment/beta/b38/b38glos.html
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