A floating buoy drifts with ocean currents, measuring salinity along its trajectory.

A weather station records wind speed at a fixed location over time.

A research drone follows an oil spill, tracking its movement and concentration.

A floating GPS-tracked particle simulates the movement of a river current.

μ is a more fundamental parameter than the kinematic viscosity (ν)

μ is relatively sensitive to changes in pressure

μ is independent of the rate of strain i.e. the velocity gradient (dv/dy) in a flow field where v=velocity and y = distance from a flow boundary

μ is numerically about 1000 times the kinematic viscosity (ν)

changes by a factor of about 6.3 between temperatures of 0^oC and 100^oC at atmospheric pressure.

is less on the moon [g_moon = 9.81/6 m/s² (approximately)] than on earth (g=9.81 m²/s) when at the same temperature and pressure

changes by about 6% between temperatures of 0^oC and 100^oC at atmospheric pressure

is measured in units of (N/m³)

always increases with decreasing temperature

changes by about 6% between a pressure of 1 atmosphere (101.3 kPa) and a pressure of 10 atmospheres (1013 kPa) at the same temperature.

σ effectively acts like a membrane stretched over the surface of the liquid

some insects can walk across water due to surface tension

σ is due to the attractive forces between fluid molecules

surface tension depends only on the liquid of concern. If water is in contact with another liquid, the surface tension at the interface is independent of the other liquid.

σ has units of (N/m) or equivalently (kg/s²)

the centre of pressure on an immersed plane surface is always below the centre of gravity of the surface because the pressure increases (linearly) with depth below the water surface; if pressure was constant with depth, the centre of gravity and centre of pressure would coincide.

the hydrostatic force acting on a vertical wall depends on the depth of the water being impounded but not on the lateral extent (away from the wall) of the water being held back 

in an inclined tube filled with fluid, the pressure difference between the top and bottom of the tube depends only on the vertical elevation difference between the two ends.

In the formula for the hydrostatic force acting on a plane surface, F=γ A h_cthe following definitions apply: h_c = depth to the centroid of the pressure diagram acting on the plane surface, A= immersed area of the plane surface, (gamma) γ = ρ.g and (rho) ρ = density of the fluid.