Practical scientific procedures and techniques

What you'll learn

1. 1

   Think of a kitchen timer ⏲️. You set the time, press start, and it counts down. That's like using a stopwatch in science!

2. 2

   What does a stopwatch measure?

3. 3

   Set the timer to 2 minutes and 30 seconds.

4. 4

   Let's time how long it takes for an ice cube to melt 🧊.

5. 5

   What do you press to begin timing?

6. 6

   Now time something yourself — a candle burning or a ball rolling down a ramp. Use the stopwatch to find how long it takes.

7. 7

   You timed a reaction that took 2 minutes and 10 seconds. How many seconds is that?