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.

• Length = 1.9 m = 190 cm
• Width = 2.5 m = 250 cm
• Height = 0.6 m = 60 cm

Step 2: Calculate the volume of the aquarium in cubic centimeters (cm^3) by multiplying the length, width, and height.

• Volume = Length x Width x Height = 190 cm x 250 cm x 60 cm = 2,850,000 cm^3

Step 3: Convert the volume from cubic centimeters to liters, since 1 liter equals 1,000 cm^3.

• Volume = 2,850,000 cm^3 = 2,850 liters

Step 4: Calculate the weight of the water that the aquarium can hold, since 1 liter of water weighs 1 kg.

• Weight = Volume