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Decimeter

A decimeter (dm) is a unit of length in the metric system. It is equal to one-tenth of a meter, or 10 centimeters (1 dm = 0.1 m = 10 cm). While not as commonly used as centimeters or meters in everyday life, decimeters are still important in scientific and technical measurements. For example, a small book or a tablet might be about 2 to 3 decimeters long. The symbol for decimeter is "dm". Although it sits between the centimeter and meter in size, people often skip using decimeters and go directly from centimeters to meters. Still, it's a helpful unit when you need a mid-sized measurement.

Millimeter

A millimeter (mm) is a very small unit of length in the metric system. It is commonly used to measure tiny objects or precise dimensions. One millimeter is equal to one-thousandth of a meter (1 mm = 0.001 m), and 10 millimeters make 1 centimeter. Millimeters are often used in fields like engineering, machining, and science where exact measurements are important. For example, the thickness of a credit card is about 1 mm. The symbol for millimeter is "mm", and you can find it on most rulers or measuring tools. Since it allows for high accuracy, the millimeter is ideal for measuring small parts, gaps, or details.