A measuring cup or one of those little cups that come on top of liquid medicines like panadol
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You can use a graduated cylinder or a measuring cup marked in milliliters to measure out 42 ml of water accurately.
The human body is made up of about 60% water, so a 70kg body would contain approximately 42 liters of water.
There would be a bit over 42 pounds. Pounds is a unit of mass/weight. Gallons is a liquid measure. They do not convert cleanly. The density of the liquid being measured can make a big difference. If the liquid is water, there is 8 pounds to a gallon.
One barrel typically contains 42 US gallons of water.
3.7854118 liters x 42 gallons is equal to 564.85094 liters.
Assuming an average adult has about 42 liters of body water, losing 4 liters would represent about 9.5% of their total body water.