How many pounds does 1.5 liters of water weigh?

To determine how many pounds 1.5 liters of water weigh, we need to know the density of water and then convert the volume from liters to pounds.

1. Density of water: The density of water is approximately $1$ kilogram per liter (kg/L), or equivalently $1$ gram per milliliter (g/mL).
2. Convert liters to kilograms: Since $1$ liter of water weighs $1$ kilogram, $1.5$ liters of water will weigh $1.5$ kilograms.
3. Convert kilograms to pounds: To convert kilograms to pounds, we use the conversion factor $1$ kilogram =2.20462

Now, calculate the weight of $1.5$ kilograms in pounds: $1.5\text{ kilograms}\times 2.20462\text{ pounds/kilogram}=3.30693\text{ pounds}$

Therefore, $1.5$ liters of water weigh approximately 3.30693 pounds.