1. The Backwash linear velocity should be 25–35 m 3 /h.m 2 at 15–27°C

2. — linear velocity of the carrier gas: helium 20 to 35 cm/s, hydrogen 30 to 50 cm/s,

3. Advection Advective transport is the process by which dissolved contaminants are transported by flowing groundwater at its average linear velocity.

4. When considering circular motion it is often easier to work in terms of the angular velocity rather than ordinary linear velocity.

5. 29 In this paper, we use artificial fields to steer and control the steering angle and derive a linear velocity control law to guarantee the optimal convergent trajectory.