(2) 3615 x 103 FPS units
We have,
[Specific latent heat] = (Heat energy/mass) = [ML2T-2/M] = [L2T-2]
∴ Unit of surface tension in SI units / Unit of surface tension in FPS system
= (m/ft)2 (1s/1s)-2
= (3.28 feet / 1 feet)2 (1) = 10.76
∴ Specific latent heat of water = 80 cal/g = 80 x 4.2J/(10-3kg)
= 336 x 103 J/kg = 336 x 103 (m2s-2)
= (336 x 103 x 10.76) FPS Units
≅ 3615 × 103 FPS Units