A scalar quantity is a type of measurement in physics that only has a size, or magnitude, and no direction. This means it tells us "how much" there is of something, but not "which way" it is going. Common examples of scalar quantities include distance, speed, mass, time, and energy. For instance, if you say a car is moving at 60 kilometres per hour, that number is the speed, and it doesn't tell you the direction the car is moving in. Scalars are different from vectors, which have both magnitude and direction.
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