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240
Multiply metres by 100.
Class 6 · English Version · General science
2026 Class 6 Science · English Version · Chapter 1 · Chapter companion part
Chapter 1: Scientific Process and Measurement
Ask a testable question, choose a fair comparison and measure with units.
Class 6 English Version chapter companion with expanded teaching, 20 written tasks and a notebook challenge. Further independent assessment and teacher-reviewed practical work remain; this is not complete textbook coverage.
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Learn the idea
An observation records what happened. A hypothesis is a testable possible explanation, not a fact already proved. Ask a clear question, plan a safe comparison, record results, look for a pattern and report what the evidence supports. A result that disagrees with a prediction is useful evidence.
A fair comparison
Change one planned factor while keeping other relevant conditions alike. To compare water loss from covered and uncovered cups, use equal starting volumes, matching cups, the same location and the same duration. Repeat if possible. Use supplied data when a practical setup is unavailable.
Quantities, units and instruments
A measurement needs a number and unit. SI base units include metre for length, kilogram for mass, second for time and kelvin for temperature; electric current uses ampere. Area in square metres and volume in cubic metres are derived units. Read a ruler from zero and a measuring cylinder at eye level; water has a curved surface, so read the bottom of its meniscus.
Calculate and check
Use 1 m = 100 cm, 1 kg = 1000 g and 1 L = 1000 mL. Rectangle area is length × width; cuboid volume is length × width × height. For an insoluble non-absorbing object fully submerged without bubbles, displacement volume is final minus initial water reading. Use a guardian or teacher for equipment; no mercury thermometer, flame or clinical measurement is needed here.
Choose a unit and record it
Use the same standard unit so that two people can compare results. Handspans differ between people. The seven SI base quantity/unit pairs are length/metre (m), mass/kilogram (kg), time/second (s), temperature/kelvin (K), electric current/ampere (A), amount of substance/mole (mol), and luminous intensity/candela (cd). Area uses m², volume m³ and speed m/s: derived units are built by multiplication or division, not simply adding unit names.
Read a length or balance carefully
Check the instrument’s divisions and zero. If a ruler’s zero end is damaged, read both ends and subtract: an object from 1.2 cm to 6.7 cm is 5.5 cm long. Look straight at the scale to reduce a viewing-angle error. To estimate one identical sheet’s thickness, measure a stack and divide by its number of sheets. A balance reading with a container includes the container; subtract its mass or use the tare control before adding the contents.
Time, area and volume in a notebook
Convert before combining measurements: 1 minute = 60 seconds, 1 tonne = 1000 kg and 1 quintal = 100 kg. For a rectangle, area = length × width, with matching length units. A volume reading in mL is not a length reading in mm. Read a liquid level with the vessel upright on a level surface; for water read the bottom of the meniscus at eye level. An absorbent or dissolving solid is unsuitable for a simple water-displacement measurement.
Temperature and a scientific report
Temperature describes how hot or cold something is; a thermometer measures it. Celsius is used in everyday readings, while kelvin is the SI base unit. Read only after the display or liquid column settles, within the instrument’s range and following its instructions. Here use supplied room-temperature readings, not a body-temperature test. A report states the question, prediction, method, observations with units, conclusion and limitations. A result that disagrees with a prediction should be reported honestly, then used to improve the investigation.
Worked example
A cuboid is 4 cm × 3 cm × 2 cm: its volume is 24 cm³. A suitable stone raises water from 40 mL to 49 mL: its volume is 9 mL, equivalent to 9 cm³.
- Identify the evidence, quantity or structure in the question.
- Write a labelled method or explanation; include units where needed.
- Check the model, explain one correction, then attempt the independent task.
Check a common mistake
Mass and weight are different quantities: a balance measures mass, while weight is a force. Also, a hypothesis does not become certain because one result agrees with it.
A ruler with a damaged end
A strip begins at 2.3 cm and ends at 9.1 cm. Length = 9.1 − 2.3 = 6.8 cm. The end reading alone is not its length.
Subtract a container; interpret a thermometer
An empty cup has mass 85 g and cup plus water has mass 205 g. Water mass = 120 g. A supplied room thermometer changes from 22°C to 26°C: temperature rises by 4°C. Neither calculation measures a person’s health.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
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28
7 × 4 = 28 cm².
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30
5 × 3 × 2 = 30 cm³.
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12
47 − 35 = 12 mL = 12 cm³, with no absorption or trapped air.
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kg
Kilogram, symbol kg, is the SI base unit of mass.
Write in your own words. A guardian or teacher should review this response.
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Use matching cups and equal starting volumes. Cover one; leave the other open. Keep location and time alike, measure loss and repeat.
Identify the changed condition, measured outcome and controlled conditions.
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A bare number does not state the scale; 8 cm and 8 m represent different lengths.
Give a concrete comparison.
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The pots may also differ in seed, light, soil or starting condition. Control relevant conditions and use repeated observations.
Name an alternative factor and an improved comparison.
Take it further
Apply the idea in a new situation and explain your method. Open writing needs a guardian or teacher to review it.
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7.2
Subtract the start reading: 8.6 − 1.4 = 7.2 cm.
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2.4
2.4 cm = 24 mm; 24 ÷ 10 = 2.4 mm per card.
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6
54 ÷ 9 = 6 g, assuming identical masses.
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105
230 − 125 = 105 g.
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155
2 × 60 + 35 = 155 s.
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5
Width = area ÷ length = 30 ÷ 6 = 5 m.
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2350
2000 + 350 = 2350 mL.
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7
27 − 20 = 7°C. This is a temperature difference.
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A
Ampere uses the capital symbol A; coulomb measures electric charge.
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Use a ruler in cm/mm, a suitable balance in g/kg, a clock or stopwatch in s, and a suitable thermometer in °C for the supplied everyday context.
Match each quantity to an instrument and unit; do not propose a mercury or clinical test.
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The original object changes as it dissolves, so the water-level difference no longer directly measures its original volume by this simple method.
Explain the condition that the method needs.
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Record the actual result and check the method or repeat with appropriate controls. Revise the explanation if the evidence continues to disagree.
Never change data to fit a prediction; distinguish checking a method from hiding an unwelcome result.
Your science notebook challenge
Prepare a four-part measurement notebook using real safe objects or the supplied examples: length with start/end readings; mass with a container subtraction; elapsed time in seconds; liquid volume and room-temperature readings. State instruments and units. Add a fair-test plan, what you would measure, and one limitation. A guardian or teacher should check actual equipment use separately.
Review with a guardian or teacher
- Use an observation, labelled diagram or stated data.
- Explain how the evidence supports your answer.
- Record one limitation or correction with a guardian or teacher.
Keep your work on paper or in a local file. This page does not upload it or automatically grade the project.
Chapter companion and further study
This original Kidemy practice follows the topic order of 2026 Class 6 Science · English Version, chapter 1, printed pages 1–12. It does not replace the complete chapter or its practical teaching.
Official book catalogue and source →
Continue with your book or teacher
- Supervised use of real instruments and independent practical observations
- An independent end-of-chapter written assessment and feedback
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