Food dye injected into olive oil forms the Saffman-Taylor fingering instability in a Hele-Shaw cell, in front of a red background.

By Hans Loewentheath, Thomas Pohlman and Grant Boerhave for Spring 2013 Team Second.
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Food dye injected into olive oil forms the Saffman-Taylor fingering instability in a Hele-Shaw cell, in front of a red background.

A mixture of blue food dye and olive oil injected into olive oil in a Hele Shaw cell fingers in the Saffman Taylor instability at small scale.

Air bubbles in blue-dyed glycerin in a Hele-Shaw cell.

A simple droplet impact can create interesting physics, including this Worthington jet.

An inverted image of a Worthington jet at We = 240, formed by a highlighter dyed water droplet impact.

A crown crater forms at We=222 when a droplet impacts a water surface. Highighter ink provides the green glow.

In this classic demonstration, caustics in a shallow wave tank illustrate the constructive interference of waves passing through a double slit.

A vortex from a ‘cannon’ sheds smoke in its wake.

A 0.5 m diameter soap bubble immediately after formation is not spherical.

The front surface of a bubble reflects surroundings, while the back surface reflects and inverts the surroundings.