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What you will need
Syringe 5 ml whith a blunt needle, Insulin syringe 1 ml, pliers, injection bottle 5 ml (Liquemin Roche), water.
Investigation
* Left: Fill a syringe with 5 ml water, pierce the stopper of the injection bottle with the blunt needle.
* Give an injection to the bottle: Press the water into it.
* Photo 2: Suck 5 ml water from the injections bottle into the syringe.
* Photo 3: The needle can be extracted with such a pair of pliers.
* Now you will to learn how the doctor fills a syringe properly (without air bubbles):
* Photo 4:  Suck as much water as possible into the syringe.
* Remove the water quickly if air bubbles are inside.
* Photo 5: Point the syringe upwards. Press the plunger until it is on the 1ml mark.
* Right: Point the syringe downwards like on the photo.
* Try to get a water drop such big. Observe your neighbour´s face in it.
* Count how many water drops you can get from 1 syringe full of water.
Results
1. You can properly fill syringes with 1 ml or with 5 ml of water (properly = free of air bubbles).
2. You can divide a 1-ml syringe of water into ...... water drops.
3. You can observe your environment in a water drop: The image is upwards down.