Scalar: A quantity that has only one property: magnitude (or value). For example, the temperature only needs to be specified in terms of its value, such as 350 K or 25 ºC, etc.

Vector: A quantity that has two properties; magnitude and direction. For example, 30 km/h to the West is velocity, a vector quantity.

Watch the video below to learn more (credits-TED-Ed):

Actually, both scalars and vectors are special cases of a general class of quantities, known as tensors. More on tensors in a future post.

Scalars and Vectors
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