Depends on what substance. A litre of water weighs 1 kg, 70 kg of water is 70 litres. For other liquids you have to go into the realm of Specific Gravity, which is the ratio of the weight of equal volumes of the liquid and water.
There are 4 liters in 4 liters.
.480 liters
?? 2.31 liters!
1.5 liters.
1.23 liters
10 liters.
Exactly 30,000 liters.
0.00000375 liters.
0.000333 liters.
0.0001 liters.
0.5 liters.
88,218 liters.