AP BIOLOGY

Detailed explanation-1: -Water has its maximum density of 1g/cm3 or 1000kg/m3 at 4∘C. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1g/cm3.

Detailed explanation-2: -At 4 °C, the clusters start forming. The molecules are still slowing down and coming closer together, but the formation of clusters makes the molecules be further apart. Cluster formation is the bigger effect, so the density starts to decrease. Thus, the density of water is a maximum at 4 °C.

Detailed explanation-3: -Water’s density is greatest at about 4 °C (39.2 °F), in the liquid phase. Ice, water’s solid phase, is more buoyant, so it forms at the surface of water bodies and freezes downward.

Detailed explanation-4: -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).

Detailed explanation-5: -Answer and Explanation: Water at 4 degrees Celsius is denser than water at 0 degrees Celsius. Water is less dense when it in its solid form as ice.