All scalar quantities have magnitudes; what scalars don't have is direction. The magnitudes can take any value, +ve or -ve (or zero).
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Zero is a number (a scalar quantity without unit) while zero vector (or null vector) is a vector quantity having zero magnitude and arbitrary direction.
Scalar quantity is when you have a magnitude but no direction such as speed
Yes, the magnitude of a vector is a scalar.
If a quantity does not have a direction, its a scalar quantity, not a vector quantity.
A scalar quantity is something that has magnitude but no directional component. Examples of scalar quantities include time, mass, energy, speed, temperature, and volume.