pressure gradient

17 LETTERS · STARTS WITH P

pressure gradient is a valid 17-letter word worth 20 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1E1S1S1U1R1E1G2R1A1D2I1E1N1T1

3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 2 + 1 + 1 + 1 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does pressure gradient mean?