length - The straight-line distance between two points, units - A quantity chosen as a standard in terms of which other quantities may be measured, opisometre - A device used to measure the length of a curve, trundle wheel - A device used to measure the length of a large curve, vernier caliper - A device that can be used to measure the diameter of a coin, zero error - The inclusion of the space between the end of the ruler and the zero mark while measuring, mass - The amount of matter in an object. This amount never changes., balance - A device used to measure the mass of an object, timer - A device used to measure time, meniscus - The curved surface of a liquid in a vessel, graduated cylinder - A device used to measure the volume of an irregular shape, density - The mass of each cubic meter of a material, speed - The distance travelled by an object in one unit of time, velocity - The speed of a body and the direction in which it is moving, acceleration - The change in speed divided by the time taken for the change,

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