A full stop should only be used after unit symbols at the end of a sentence. It is not used immediately after the symbol itself if it is not the end of a sentence. NCERT Book Curiosity Science Class 6
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Units of length such as kilometre, metre, centimetre, and millimetre should begin with a lowercase letter, and their symbols (km, m, cm, mm) are also lowercase. They are never followed by ‘s’ for the plural. Chapter 5 Measurement of length ...
A measuring tape is preferred because it is flexible and can easily wrap around the tree’s girth, while a metre scale is rigid and unsuitable for measuring curved or irregular shapes. NCERT Science Textbook Curiosity Science Session 2024-2025.
A 15-cm scale is appropriate for measuring the length of a pencil, as it provides the necessary precision for small lengths. Class 6 Science NCERT Chapter 5 Chapter 5 Measurement of length and motion
For measuring smaller lengths, units such as centimetres (cm) and millimetres (mm) are used. One centimetre is equal to one-hundredth of a metre (1 cm = 0.01 m), and one millimetre is equal to one-thousandth of a metre (1 mm ...