kilograms
A litre is a metric measure of capacity. A kilogram is a metric measure of weight. The question contains insufficient information to enable a meaningful answer to be given.
Answerput the elephant onto a boat. Measure the displacement by looking at the water-line, and record this mark. Remove the elephant. Add known weights to the boat (i.e 1kg weights) until the water level reaches that of the elephant. Then, count and calculate the weight. This should be the exact weight of the elephant!
metric unit
Litre
Any size cup? Weight the empty cup. Fill it with water. Measure the weight increase. Calculate volume from density of water: 350 g increase means 350 mL of water - you'll need to do the math for non-metric examples.
Only in the metric system. The metric system bases its unit of weight, the gram, on the weight of one millilitre of water. Therefore one litre of water (or other liquid which is mostly water) weighs one kilogram (1000 grams)
It depends on the matter. Regular solid matter could be measured in metric measurements with a rule or a tape measure. Or in weight. Or in the volume of water the matter displaces, in which case the measurement would be in litres and millilitres.
millimetres.
mL, L, cm3, m3 are all SI units that can be used to measure the volume of water.
its liters
Pints
Kilometers.