A cast iron bomb is completely filled with ice water, then placed into a dry-ice/acetone slush and covered with a wooden box. When the water in the bomb freezes, the cast iron bomb explodes, breaking into several pieces, and destroying the box in which it was placed.
An ice cube made from normal water floats in a beaker of liquid water.
An ice cube of deuterium oxide (containing a heavier isotope of hydrogen) sinks in water.
A normal ice cube is less dense than liquid water, but a deuterium oxide ice cube is more dense than liquid water.
An H2O ice cube is less dense than liquid water, but a D2O ice cube is more dense than liquid water.
Introduction to the floating squares demonstration shows the preparation of the square of paper rubbed with graphite on one side.
A paper square rubbed with graphite on one side is placed at the interface between two immiscible liquids (carbon tetrachloride and water).
Carbon dioxide gas is poured down a covered trough with candles inside.
Methane gas from a beaker flows up a covered trough to a candle flame.
Balloons filled with gases more dense than air will fall.
