Other smart fluids change their surface tension in the presence of an electric field.

Also see Ferrofluid for how some liquids behave in presence of a magnetic field.

In the presence of a strong gravitational field, light follows this curved space time.

Inertial cavitation can also occur in the presence of an acoustic field.

A current-carrying wire feels a force in the presence of a magnetic field.

The presence of a magnetic field indicates that the planet is still geologically alive.

They act like little tops, rotating in the presence of a magnetic field.

Rays of light bend in the presence of a gravitational field.

The particles are given a charge by exposing them to ions from an electrical discharge in the presence of a strong field.

He discovered that a spectral line is split into several components in the presence of a magnetic field.