30 litres of water weighs about 65 pounds, so a fit person should be able to lift it.
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A liter weighs 1 kg; 30 l weighs 30 kg - that is heavy but most people over age 15 can lift it
You can lift a locomotive or a house with 1 psi, if the pressure is applied over a large enough area.
Archimedes' principle: an object in water experiences an upward lift equal to the weight of the volume of water being displaced. volume of water displaced = 8000 cm3 weight of water displaced ~ 1 g/cm3 at room temperature and sea level weight of cube in air = 16000 kgf lift ~ 8000 gf = 8 kgf weight of cube in water = 16000 kgf - 8 kgf = 15992 kgf
The answer would depend on the units used for the force. Since these are not specified, it is not possible to answer the question.
A forklift will lift up to ten thousand pounds. A material lift is smaller and will only lift about five hundred pounds. There also a price difference if you know which one you need and want.