--- title: "Measuring accurately" description: "Make systematic and careful observations, and take accurate measurements in standard units using suitable equipment such as rulers, thermometers, measuring jugs and scales" canonical: https://lightmysky.com/learn/science/measuring-accurately-mt_nUnowllzaN source: https://lightmysky.com/learn/science/measuring-accurately-mt_nUnowllzaN.md retrieved: 2026-10-19 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Measuring accurately Make systematic and careful observations, and take accurate measurements in standard units using suitable equipment such as rulers, thermometers, measuring jugs and scales Subject: Science · Area: Scientific Inquiry · Ages 7 to 9 Page: https://lightmysky.com/learn/science/measuring-accurately-mt_nUnowllzaN ## Ready when they can - 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 ## Lesson: Measuring accurately You have practised looking closely. Measuring adds a number and a unit to an observation. A ruler measures length or height. Centimetres are written cm. Choose a ruler long enough for the object. **Example.** Line up one end of a pencil with the ruler's zero mark. Look straight down at the mark beside the other end. The hop shows a pencil spanning 0 to 7 cm, so its length is 7 cm. A thermometer measures temperature: how hot or cold something is. In this lesson, we use degrees Celsius, written °C. The cm marks on a ruler measure length. The ml marks on a jug measure liquid volume. A systematic method follows planned steps. Use the same measuring method each time and record each result with its unit. If you change the method, write down what changed. A measuring jug measures liquid volume in millilitres, written ml. Put the jug on a level surface. With an adult's help, pour in the water. Read the bottom of its curved surface at eye level. Scales measure mass, not volume. **Example.** Sam records 14°C at 9am, 19°C at 12pm and 17°C at 3pm. Each bar label gives its time and temperature. Find the time you need, then read the temperature in that label. Bar heights help you compare the temperatures. For a liquid-in-tube thermometer, wait until the liquid line settles before reading it. Look at the number beside the top of the line. Write the number and °C. An adult should help you use the thermometer safely. Mass and volume are different measurements. Grams, written g, measure mass. Millilitres, written ml, measure volume. Water can have both a mass and a volume. To measure mass, put scales on a level surface and check zero. With a container, reset to zero before adding water. *(drawing: The gap between neighbouring centimetre marks is 1 cm. Measure from the zero mark, which may not be at the ruler's edge.)* **Recap.** Choose the right tool, read it closely in the correct units, and measure the same way every time. ## Practice 8 questions on this page, each with its working shown. ## Needs first - [Measurable attributes of objects](https://lightmysky.com/learn/mathematics/measurable-attributes-of-objects-mt_NtJYlJdUe9) - [Observing with simple equipment](https://lightmysky.com/learn/science/observing-with-simple-equipment-mt_vJO5Bxk4z-) ## Opens up - [Recording and presenting data](https://lightmysky.com/learn/science/recording-and-presenting-data-mt_7IFpDVNsmt) - [Accurate Measurement](https://lightmysky.com/learn/science/accurate-measurement-mt_Psun-u_lPf) - [Geographical Fieldwork](https://lightmysky.com/learn/geography/geographical-fieldwork-mt_RT-RAZ0SRX)