PPT Science Abbreviation

Parts Per Trillion

Polypurine Tract

Precipitation

A process whereby salts drop or come out of a water solution. Rain, snow, hail, or sleet falling to the ground. In metals, the separation of a new phase from solid or liquid solution, usually with changing conditions of temperature, pressure or both.

Pulsed Plasma Thruster

Palmitoyl Protein Thioesterase

Parts Per Trillion 1012

Pen-And-Paper Testing

Permanent Part Time

Personal Protective Tevhnology