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W1 Distributing water: From iceberg to drops and micro drops
Photo 1  shows the earth from the space: There is much more sea water than land. The clouds on the photo are tiny water dops or ice crystals.
In Photo 2 Four arrows point to an iceberg that broke off from Antarctica 8 years ago. Scientists have calculated that it had the size of Jamaica.
Photo 3: most of an iceberg floating on the sea is below its surface.
Photo 4: A syringe full of water ise enough for most of your experiments. 1 ml means: This syringe contains 1 millilitre.1 000 of such syringes can take the water from 1 litre: 1 litre = 1000 ml. Photo 5: A water drop works as a lense: You can see an image of a a house with the roof pointing downwards. Right photo: The content of one of these syringes can be distributed into single drops. If you fix a hypodermic needle (after blunting!) at the end of the syringe you will get even smaller drops = Micro drops.

Get aquainted with a 1-millilitre syringe: From millilitre to microlitre

Chemistry investigates substances like water, air, soil, food, fuel. In your first experiment you will measure how much space a drop of water takes.
Each measurement includes a number, a unit (like litre) and sometimes a prefix (like milli or micro):
Your syringe has space for 1 milliliter [ml] which is = "100 units" or = 1000 microlitres [µl].
The space a substance takes is called its volume.
Material
Tray, insulin syringe 1 ml (Take only syringes from a pharmacy!), blunted hypodermic needle (0.45 x 25 mm), 2 high ampoules (5 ml), clean plastic cover of a margarine box, toilette paper, tap water, Cola.
Experiment
1. Fill an insulin syringe with exactly 1.0 ml of water (Photo 4). Air bubbles are to be removed before by pumping with the plunger.
2. Hold it vertically 1 cm above the Margarine cover and distribute the water drop by drop (Photo 5: A dop as lense).
3. Count how many drops you can get from one syringe (right photo ).
4. Press a blunted hypodermic needle onto the syringe,  distribute 0.1 ml of water as micro drops.
(5. Calculate the volume of each drop and of each micro drop of water.)
6. Measure which volume of water you can transfer into the high ampoule without overflowing (left photo).
Observations
a)    1 mL (1000µl) gives ......... drops,
b) 0.1 mL ( 100 µl) gives ........ micro drops.
c) The high ampoule takes .....,... ml water without overflowing.
Explanation, Calculations
The surface tension of water is responsible for the shape of the dop and of the water surface on the ampoule. (The water particles at the surface are attracted by the water particles below them. Those at the surface form an invisible film, on which a waterstrider can run around.

A drop has a volume of about 1000/...... microlitres (µl), the volume of a micro drop is about 100/.... µl.

Home experiments
1. Distribute 1 mL of stale Cola or red tea drop by drop onto a clean plastic cover of a margarine box.
2. Leave it for drying and bring the cover with you to school.