Speed is a function of distance and time. For example we refer to 'miles per hour' or 'kilometres per hour' or 'feet per second'' or metres per minute' etc.
To determine speed, you need to know the distance travelled and the time it took to travel that distance.
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To describe velocity, you need to know the speed at which an object is moving and the direction in which it is moving. Velocity is a vector quantity that combines both magnitude (speed) and direction.
To calculate velocity, you need to know both the distance traveled and the time taken to travel that distance. Velocity is the rate at which an object changes its position. Mathematically, velocity is calculated as distance divided by time.
The slope of a time-distance chart would be a constant. The slope of a time-velocity chart would be 0.
velocity
To find average velocity, you need to know the displacement. If you knew displacement, average velocity would be found by: V = Displacement / time
To calculate the flue gas velocity in an air preheater, you would need to know the volumetric flow rate of the flue gas passing through the preheater and the cross-sectional area of the preheater. You can then use the formula: Velocity = Volumetric flow rate / Cross-sectional area of preheater. This calculation will give you the velocity at which the flue gas is moving through the air preheater.