A selection of materials in the form of rectangular blocks, intended to familiarize students with the appearance, feel, texture, hardness and density of a range of common substances.

• Blocks, 50 x 40 x 30mm: softwood, hardwood, paraffin wax, aluminium, iron, foamed polystyrene
• Blocks, 20 x 20 x 100mm: Perspex, glass, slate, aluminium, softwood, marble
• Lead 50 x 50 x 20mm
• Aluminium 50 x 50 x 80mm
• Hardwood 50 x 50 x 200mm
• Brass 20 x 20 x 50mm
• Iron 40 x 40 x 20mm
• Supplied as a set of 34 blocks, 2 of each material
• Eisco type PH0114

This apparatus is designed to determine the approximate value of Planck's constant, using a range of LEDs of known wavelength, to allow the electron/photon energy to be calculated. The apparatus includes 7 LEDs, covering the light range from deep blue at 470nm to near IR at 940nm, mounted on a box with 4mm sockets for attachment to a voltmeter and ammeter for voltage and current measurements. By monitoring the voltage at which each LED just begins to emit light, a graph of energy input as a function of light emitted frequency can be plotted and an approximate value of Planck's constant can be deduced.

• Requires 9V DC power supply

The four specimens in this set will help explain to students the concept of mole.

The Mole Set contains four element specimens: Copper, Iron, Zinc and aluminium. Each sample contains one mole (6.02 x 10²³ atoms) of the element.

• Helps to explain the concept of mole
• Each sample contains 1 mole (6.02 x 10²³ atoms)
• Set contains specimens of Copper, Iron, Zinc and Aluminium