p

Science Dictionary
P  
  1. The symbol for parity.

  2. The symbol for phosphorus.

  3. The symbol for power.

  4. The symbol for pressure.


American Heritage
Science Dictionary
phosphorus   (fŏs'fər-əs)  Pronunciation Key 
Symbol P
A highly reactive, poisonous nonmetallic element occurring naturally in phosphates, especially in the mineral apatite. It exists in white (or sometimes yellow), red, and black forms, and is an essential component of protoplasm. Phosphorus is used to make matches, fireworks, and fertilizers and to protect metal surfaces from corrosion. Atomic number 15; atomic weight 30.9738; melting point (white) 44.1°C; boiling point 280°C; specific gravity (white) 1.82; valence 3, 5. See Periodic Table.
The American Heritage® Science Dictionary
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