What is the effect of pressure on viscosity of liquid?

The effect of pressure on the viscosity of a liquid can vary depending on the specific characteristics of the liquid. In general, increasing pressure tends to decrease the viscosity of liquids, particularly for liquids that are compressible.

This effect can be explained by the changes in molecular interactions within the liquid under pressure. When pressure is applied, the molecules in the liquid are brought closer together, which can reduce the distance between them and allow for easier flow. This is especially true for liquids whose molecules can be compressed, such as gases and some low-viscosity liquids.

However, for liquids that are not easily compressible, such as water, the effect of pressure on viscosity may be minimal or even negligible within typical pressure ranges.

It's worth noting that the effect of pressure on viscosity is not universal and can vary depending on factors such as temperature, molecular structure, and specific interactions between molecules in the liquid. Experimental data or theoretical models may be required to accurately predict the effect of pressure on viscosity for a particular liquid under specific conditions.