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Scalars are quantities that have magnitude only.They are independent of direction. Typical examples of scalar quantities are time, speed, temperature, and volume,density, mass and energy. For example, the units for time (minutes, days, hours, etc.) represent an amount of time only and tell nothing of direction.

Vectors have both magnitude and direction. The length of a vector represents magnitude. The arrow shows direction.

Increase/Decrease in Temperature - The measurement of the medium’s temperature is a scalar quantity; the measurement of the increase or decrease in the medium’s temperature is a vector quantity.

Velocity - The measurement of the rate at which an object changes position is a vector quantity.