Is a gallon of milk heavier than a gallon of water or vice …

A gallon of milk is slightly heavier than a gallon of water. This is because milk contains more substances besides water, such as fats, proteins, and sugars, which increase its density.

To put it into perspective:

• A gallon of water weighs approximately 8.34 pounds (3.78 kg).
• A gallon of milk weighs about 8.6 pounds (3.9 kg).

So, milk is denser and heavier than water by a small amount.