Physics > Heat > Thermal Expansion

It comprises two cast iron uprights vertical pillars height approx 180 mm linked by rods, supporting an expansion bar, length 380 mm, fixed to one upright and resting on a friction pointer at the other with scale, supplied with one each aluminium; iron and brass expansion bars.

Micrometer Screw Form, with built-in micrometer. A metal rod 500 x 4.5 mm (L x d) enclosed in a nickel plated brass tube with three tubules for steam inlet, outlet and thermometer. The metal rod under investigation is supported in the centre of steam jacket. The micrometer screw reading to 0.01 mm at the opposite end for measuring the expansion when rod is heated by steam. Supplied complete with copper, brass and iron rods but without thermometer.

It consists of a 25 mm dia brass ball, secured to a brass ring by a chain, with wooden handle. Brass ball when cold will pass through the ring, but when heated, it will not. Thus this simple apparatus demonstrates effectively the thermal expansion.

A. Ball Dia 25 mm
B. Ball Dia 18 mm

Same as P-2275 But with stand as shown.

A. Ball dia 25 mm.
B. Ball dia 18 mm.

To illustrate expansion on heating and contraction on cooling. Comprises a bar of steel 110 x 12mm, supported on rod with wooden handle and gauge with cutout sliding fit over ends of bar and a 12mm holes.

To demonstrate the forces exerted during thermal expansion or contraction. It comprises a heavy cast iron frame with slotted end pillars to carry a stout iron bar. The bar is threaded at one end for large tensioning nut and has holes at the other end to accommodate the cast iron breaking bars. Supplied complete with 10 breaking bars.

It is to demonstrate, curvature introduced by unequal expansion of two different metals. Two different metal Brass and Iron strips riveted together from end to end and fitted with wooden handle.

A. 150 x 15 mm (LxW)
B. 200 x 25 mm (LxW)
C. 300 x 25 mm (LxW)

Note : Bars with other different metal combinations can also be supplied, on demand.

Demonstrate the principle of thermostat. A vertically mounted bimetallic strip is used to open or close an electric circuit with change in temperature. Consists of a binding posts for connection to low current circuits and adjustable contacts.

Four copper and four iron wires 125mm long approx twisted together to form seven junctions, four on one side, three on other side with brass connectors.

Demonstrates the production of thermoelectric e.m.f. One each of copper and constantan wire 300 mm long soldered together at one end with crocodile clips at free ends.