Thames & Kosmos Global Water Quality handleiding

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Handleiding

EXPERIMENT 6 Living things and water

Explanation:

In the heat, the slices shrink and lose

weight as the water contained in them

evaporates. A potato, for example,

contains up to 80% water (over ¾ of

the potato is water), and with the

cucumber it’s over 95% (except for a

small portion, it consists completely of

water). All living things need water to

survive!

The next experiment will show you how important water is

for all living things, such as plants and animals.

All plants and animals are made largely of water, and therefore

they need water in order to survive. The next experiment will show

you just how much water is contained in fruits and vegetables!

You will need:

fruit or vegetable (such as an apple, a cucumber, or

a potato), plate, knife, kitchen scale (not included)

Cut the fruit or vegetable into slices on

the plate. Have an adult help you! Weigh

the slices on a kitchen scale and note the

weight!

Set the plate with the

fruit or vegetable slices

in the sun or on a warm

heater for a few hours.

Check their weight!

Let the slices dry

for several days, until

their appearance stops

changing. Weigh them

again.

Global Water Quality Manual 2013.indd 13 2/7/13 10:22 AM

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