Measuring accurately
Make systematic and careful observations, take accurate measurements using standard units and equipment including thermometers and data loggers
What a learner can do afterwards
- Use at least three types of measuring equipment correctly (ruler, thermometer, measuring jug, scales)
- Read measurements in standard units (cm, ml, °C, g) with reasonable accuracy
- Make systematic observations by following a planned method consistently
The lesson
Scientists do not guess when they measure. They pick the right tool, read it carefully, and follow the same steps every time. Doing it the same way each time is called a systematic method.
A thermometer measures temperature in degrees Celsius (°C). Wait until the line stops moving, then read the number it lines up with. Do not read it too soon.
Sam checks the temperature outside at 9am, 12pm, and 3pm, using the same thermometer each time. She writes down each number right after reading it. Her chart for one day shows 14°C, 19°C, and 17°C.
Pick the right tool for the job: a ruler for length in cm, a thermometer for temperature in °C, a measuring jug for liquid in ml, and scales for mass in g. Always read to the closest line, not a guess.
Choose the right tool, read it closely in the correct units, and measure the same way every time.
Watch it
Where it sits
Where this leads
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.