CoachThe second is the unit of time used all over the world, written . One second is about one calm heartbeat, or the steady tick of a big clock. Saying “one little crocodile, two little crocodiles” at a calm pace counts roughly one second per crocodile.
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Example 8.8 (Try it: how many seconds?)
Count seconds steadily while: you hold your breath comfortably; the tap fills a glass; a friend runs to the fence and back. The glass might take seconds, the run . Now the tooth-brushing and the song from before can get numbers — and numbers, as with lengths, can travel and be checked.
Example 8.9 (Hours on the clock)
Seconds are for short things. Long stretches are counted in hours: school mornings last hours, a night of sleep too. The clock’s short hand points to the hour: straight at the , it is three o’clock; between and with the long hand pointing straight down, it is half past three. A whole day and night together hold hours — while the Earth, remember, makes one full turn.