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In experiment 4 you have balanced 4 drops of water by 1 metal closure of a Liquemin bottle. Now you will learn how to measure exactly 1.0 ml in a syringe and to weigh it.
Left:  This is a syringe with exactly 1 milliliter (mL)  of a liquid.
(By repeating to suck liquid and to press it back quickly you will be able to remove air bubbles.)
Photo 2: Add  1 ml of water to the left pan of the scale. Rebalance by adding metal closures (0.2 g) to the right one: 1 ml of water is balanced by 5 Liquemin closures, the density of water is 1.0 g per mL.
Photo 3: Replace 1 ml of water by 1 ml of Dead Sea water: The scale is not balanced, Dead Sea water is more heavy than water.
Right: Rebalance by adding more metal closures (0.2 g) to the right pan: 1 ml of Dead Sea water is balanced by 6 Liquemin closures, the density of Dead Sea water is 1.2 g per mL.