Page 7 - Time

Step 5 Step 6

Empty the top and bottom half of
the bottle.
Use the permanent
marker to mark how Repeat steps 3 to 5.
much water has
flowed into the
bottom half when
60, 120, 180 and [source: http://www.wikihow.com/make-a-
240 counts are reached. Water-Clock-(Clepsydra)]

You can now use the water clock to measure the time it takes to do
something in units of 60 counts.
2. Each group uses their water clock to measure how long one of
the learners in the class can hold her or his breath. Compare
the time taken according to the different water clocks. What
do you notice? Explain why this is so.

3. Place all the water clocks next to each other. What do you notice
about the marks you made earlier at 60, 120, 180 and 240?

Counting is not a good way to measure time, because some
people count faster than others. People decided long ago to use
the changing of days to measure time.
The sun appears each day, it disappears later, and it appears
again the next day. The period of time that starts when the sun
appears on one day, and ends when the sun appears on the next
day, is called one day. The day is divided into 24 equal periods
which are called hours.
1 day = 24 hours

1 hour = 60 minutes
1 minute = 60 seconds

4. For approximately how many minutes are you in school each
day of the week?

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