you need 2 pails and a measuring cup (500ml)
1. Fill a pail with water.
2. Using a measuring cup, scoop the water from pail 1 to pail 2.
3. As you pour the water into pail 2, say aloud 500ml.
4. Scoop another cup of water and pour into pail 2.
5. Say aloud 1000ml as you pour the second cup of water into pail 2.
6. Repeat the process and say aloud 1500ml, 2000ml, ... till all the water in pail 1 has been poured into pail 2.
7. Now you know the volume of of liquid in pail 1.
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