Try using a triple beam balance, or a electronic scale. The units to measure the mass of the book would be in grams.
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The SI, or metric, unit of weight is the same as the unit of force, namely the newton.
It would be more appropriate to measure a book in centimeters as meters might be too large a unit of measurement for a book. Additionally, centimeters provide a more precise measurement for the size of a book.
You would use a ruler or a meterstick to measure the length of the strap on your book bag. A yardstick is typically used for larger measurements and may not be as precise for measuring smaller objects like a strap.
Inches or centimeters
You would typically use centimeters (cm) or millimeters (mm) to measure the width of a book. These units provide a more precise measurement for smaller objects like books.
Pounds