Hardness of Solid Substances - Grinding Iron
Iron metal is not easily ground or crushed.
solids
Hardness of Solid Substances - Grinding Zinc
Zinc metal is not easily ground or crushed.
Heavy Water Ice Cubes - Deuterium Oxide
An ice cube of deuterium oxide (containing a heavier isotope of hydrogen) sinks in water.
Heavy Water Ice Cubes - Comparison 1
A normal ice cube is less dense than liquid water, but a deuterium oxide ice cube is more dense than liquid water.
Paramagnetism: Compounds - Introduction
A series of compounds in small vials is brought close to the poles of a large, strong permanent magnet.
Heavy Water Ice Cubes - Comparison 2
An H2O ice cube is less dense than liquid water, but a D2O ice cube is more dense than liquid water.
Paramagnetism: Compounds - Sodium Chloride
When a sample of sodium chloride, NaCl, is brought near the poles of a magnet, there is no attraction of the sodium chloride to the magnet.
Piezoelectric Effect: Part 1 of 2
A piezoelectric crystal is pressed and released producing an electric current that lights an attached bulb.
Paramagnetism: Compounds - Manganese(II) Sulfate Monohydrate
Manganese(II) sulfate monohydrate, MnSO4·H2O, is strongly attracted by a magnet.
Piezoelectric Effect: Part 2 of 2
A piezoelectric crystal is pressed producing an electric current that lights an attached bulb. While still pressed the electric circuit is broken. Once the circuit is restored and electricity allowed to flow, the stress in the crystal is relieved.