How are speed and velocity different? velocity tells you how fast and gives a direction. speed only tells how fast. speed is a vector and velocity is a scalar. speed tells you how fast and gives a direction. velocity only tells how fast. speed is constant and velocity can change.

Velocity tells you how fast and in what direction. Speed only tells how fast.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.