Attention should be paid to use contrast agents of low viscosity.

Water has a very low viscosity - it is thin and flows easily.

It was especially good at collecting diesel fuel, which is difficult to clean up because of its low viscosity.

These have a very low viscosity, which is why they 'flood' rather than form taller volcanoes.

In a simple example, water has a low viscosity, as it is 'thin'.

If the lava is thin (low viscosity), then it just flows out like water.

If the glass has low viscosity, the drop will liquify and fall very suddenly.

It also has a low viscosity and, therefore reduced pumping requirements.

Topical solutions are of low viscosity and often use water or alcohol in the base.

The equation fails in the limit of low viscosity, wide and/or short pipe.