An aquarium in the form of a rectangular parallelepiped with a base of 0.4 × 0.2 m

An aquarium in the form of a rectangular parallelepiped with a base of 0.4 × 0.2 m is filled with water to a height of 0.15 m. What is the mass of this water?

Answer: the mass of water is 12 kg.

With a water density of 1000 kg / m³, 1 liter of water has a mass of 1 kg.

Also, do not forget that 1 m³ contains 1000 liters.

Since the aquarium has the shape of a rectangular parallelepiped, the volume of water in it can be determined as the product of the area of the base of the aquarium by the value of the height of the existing water level in it:

Let’s determine the volume of water:

0.4 * 0.2 * 0.15 = 0.012 m³.

Let’s translate the resulting volume of water into liters:

0.012 * 1000 = 12 liters.

Since the mass of 1 liter of water is 1 kg, the total mass of water in the aquarium will be 12 kg.