Answer:
1. A common unit of measurement for
water's density is gram per milliliter
(1 g/ml) or 1 gram per cubic
centimeter (1 g/cm3). Actually, the
exact density of water is not really 1
g/ml, but rather a bit less (very, very
little less), at 0.9998395 g/ml at 4.0°
Celsius (39.2° Fahrenheit).
2. Water density changes with
temperature and salinity. Density is
measured as mass (g) per unit of
volume (cm). Water is densest at
3.98°C and is least dense at 0°C
(freezing point). Water density
changes with temperature and
salinity.
3. When water is a liquid, the water
molecules are packed relatively
close together but can slide past
each other and move around freely
(as stated earlier, that makes it a
liquid). Pure water has a density of
1.000 g/cm3 at 4° C. As the
temperature increases or decreases
from 4° C, the density of water
decreases.
