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Written by Palak Mall, Senior Content Writer · reviewed by Arvind Kumar, Lab Equipment Specialist, 12+ years in laboratory supply · updated 17 October 2026

Properties of Solids lists 11 items for elasticity and density practicals in school and college physics labs: a Hooke’s law apparatus and three packs of springs, metal cylinders, cubes and spheres for density and specific gravity, a specific gravity kit, and a kit of assorted material blocks. Sizes below are the ones given in each listing.

Springs and Hooke’s law

Item	Coil diameter	Closed length, coil / overall	Limit, as listed
Springs Steel, Expandable (pack of 25)	About 16 mm	20 mm / 50 mm	Extends about 150 mm without permanent deformation
Expandable Springs, Long Extension (pack of 25)	About 15.5 mm, wire 0.7 mm	20 mm / 55 mm	Extends about 450 mm without permanent deformation
Springs Extension, Type 1	About 19 mm, wire 0.6 mm	23 mm / 56 mm	Maximum recommended load 100 g

The Hooke’s Law Apparatus has a 15 cm adjustable mirror scale on a support 30 cm high, with an adjustable hook and a spring carrying a weight hanger and pointer. The mirror removes parallax: the pointer is read when it hides its own reflection. Five 20 g slotted weights are recommended with it. Loading the spring in equal steps and plotting extension against load gives a straight line up to the limit of proportionality, whose gradient gives the spring constant. The same set-up, with the load set bouncing, is listed for simple harmonic motion experiments.

Density and specific gravity

Set	Metals or materials	Size, as listed
Cubes for Density Investigation	Brass, lead, zinc, copper, aluminium and iron, each with a hook	20 mm cubes, set of 6
Specific Gravity Metal Cylinders	Aluminium, steel, brass and copper, each with a hook	5 cm long, 13 mm in diameter, set of 4
Specific Heat Specimen Set	Copper, lead, brass, zinc, iron and aluminium, stamped with the metal name	Equal mass of 100 g and equal diameter of about 16 mm, so lengths run from about 5 to 19 cm; drilled near one end for suspension; in a wooden block
Spheres, Assorted	Wood, aluminium, steel, copper, brass and lead	Six solid 25 mm balls in a plastic box
Spheres, Drilled, Assorted	Wood, aluminium, steel, copper, brass and plastic	Six 25 mm balls, each drilled with a 3 mm hole

The specific heat set doubles as a density lesson. Because all six cylinders have the same mass and diameter, the denser the metal, the shorter the cylinder: lead is the shortest and aluminium the longest. The equal-size cubes and spheres make the opposite point, since equal volumes of different materials weigh different amounts. The Specific Gravity Set gives a group everything for a first specific gravity experiment: an aluminium displacement vessel, an overflow bucket, a spring balance and three metal cubes.

Materials

The Assorted Materials Kit is a set of rectangular blocks of different sizes for learning the appearance, feel, weight, texture, hardness and density of common materials. The materials named in the listing are Perspex, glass, slate, aluminium, iron, marble, softwood, hardwood, paraffin wax and foamed polystyrene.

Related ranges

This range is part of Mechanics & Fluid Mechanics. Slotted weights and spring balances are under Weights & Balances, displacement vessels and the bucket and cylinder under Properties of Liquids, and calorimeters for specific heat under Heat Capacity and Heat Conduction.

Questions buyers ask

Which springs stretch the furthest?
The Expandable Springs, Long Extension, listed at about 450 mm of extension without permanent deformation, against about 150 mm for the standard expandable springs. Both come in packs of 25.

Are weights supplied with the Hooke’s law apparatus?
The listing recommends five 20 g slotted weights for use with it; slotted weights are listed under Weights & Balances.

Why are the specific heat cylinders different lengths?
All six have the same 100 g mass and about the same 16 mm diameter, so the length depends on the density of each metal.

Which metals are in the density cube set?
Brass, lead, zinc, copper, aluminium and iron, as 20 mm cubes with hooks.