- Volume of fish tank = 15.7 gallons
- Density of water = 1.0 g/mL
Step 1: Convert gallons to liters
1 gallon = 3.78541 liters
Therefore, 15.7 gallons = 15.7 * 3.78541 = 59.71 liters
Step 2: Calculate the mass of water in kilograms
Density = mass/volume
Mass = density * volume
Mass = 1.0 g/mL * 59.71 L
Mass = 59.71 kg
Step 3: Convert kilograms to pounds
1 kilogram = 2.20462 pounds
Therefore, 59.71 kg = 59.71 * 2.20462 = 131.6 pounds
Conclusion:
The fish tank holds approximately 131.6 pounds of water.