One litre of water weighs 1 kg, and one liter equals 1000 cubic cm. An aquarium is 1.9 m by 2.5 m by 0.6 m.

The question seems to be incomplete. However, if you're asking for the volume or weight of the water that the aquarium can hold, here's how you can calculate it:

Step 1: Convert all dimensions from meters to centimeters, since 1 meter equals 100 cm. So, the aquarium is 190 cm by 250 cm by 60 cm.

Step 2: Calculate the volume of the aquarium in cubic centimeters. The volume of a rectangular prism (which an aquarium typically is) is length x width x height. So, the volume of the aquarium is 190 cm x 250 cm x 60 cm = 2,850,000 cubic cm.

Step 3: Since 1 liter equals 1000 cubic cm, the volume of the aquarium is 2,850,000