revolutions per minute.
Related Terms |
PPM
parts per million (1/ppm = 0.000001). Generally by weight. 100 ppm = 0.01%; 10,000 ppm = 1%
|
LONG-PLAYING RECORD
[ENG ACOUS] A 10 or 12inch (25.4or 30.48-centimeter) phonograph record that operates at a speed of 331/3 rpm (revolutions per minute) and has closely spaced grooves, to give playing times up to about 30 minutes for one 12-inch side. Also known as LP record; microgroove record.
|
