internal energy

15 LETTERS · STARTS WITH I

internal energy is a valid 15-letter word worth 18 points in Scrabble and 22 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1N1T1E1R1N1A1L1E1N1E1R1G2Y4

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 2 + 4 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does internal energy mean?