• the type of fl uid that is flowing (thin fluids flow faster than thick ones) • the force pushing on the fluid (stronger forces produce faster flow rates) • the size of the pipe or opening the fluid is flowing through (larger openings allow for faster flow) • the type of surface over which the fluid is flowing (smooth surfaces allow for faster flow)
Viscosity
How easily fluid’s particles past each other
syrup of soy sauce
Cohension
How strongly particles of a fluid attract
Thicker fluids are more viscous and have slower fl ow rates.
Less viscous fluids are thin and runny and have faster flow rates.
Surface Tension
Liquids surface
attraction among the particles that form the surface of a liquid
Adhension
Attraction between the particles of one and another substance.
The fluid’s attraction to the material the pipes and tubes are made of slows down the flow of the fluid.
water flows faster at the centre of a stream or river than along the edges.
