Home » Our Product » Thermal Expansion and Thermo Electricity

Thermal Expansion and Thermo Electricity Manufacturer, Suppliers and Exporter in India

School Instrument India is leading Thermal Expansion and Thermo Electricity Manufacturer,and supplier and Exporter in India, Algeria (Algiers), Angola (Luanda), Argentina (Buenos Aires), Armenia (Yerevan), Australia(Canberra), Austria (Vienna), Bahrain (Manama), Bangladesh (Dhaka), Bhutan (Thimphu), Bolivia (Sucre), Botswana (Gaborone), Brazil (Brasília), Brunei (Bandar Seri Begawan), Montenegro (Podgorica), Morocco (Rabat), Mozambique (Maputo), Myanmar (Naypyidaw), Namibia (Windhoek), Nepal (Kathmandu), New Zealand (Wellington), Nigeria (Abuja), Oman (Muscat), Palestine (Ramallah), Panama (Panama City), Papua New Guinea (Port Moresby), Paraguay (Asunción), Peru (Lima), Philippines (Manila)¸ Portugal (Lisbon), Qatar (Doha), Rwanda (Kigali), Saudi Arabia (Riyadh), Senegal (Dakar), Serbia (Belgrade), Sierra Leone (Freetown), Slovakia (Bratislava), South Africa (Cape Town) (Pretoria) (Bloemfontein), South Sudan (Juba), Spain (Madrid), Sri Lanka (Sri Jayawardenepura Kotte) (Colombo), Sudan (Khartoum), Syria (Damascus), Tanzania (Dodoma), Thailand (Bangkok), Togo (Lomé), Tonga (Nuku'alofa), Trinidad and Tobago (Port of Spain), Tunisia (Tunis), Turkey (Ankara), Turkmenistan (Ashgabat), Uganda (Kampala), United Arab Emirates (Abu Dhabi), United Kingdom (London), United States (Washington, D.C.)

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

Thermal Expansion and Thermo Electricity lists 11 items for school and college physics labs: seven apparatus that show or measure how solids expand when heated, three thermoelectric items from a single copper-constantan thermocouple to a 12-pair bismuth-antimony thermopile, and packs of metal rivets for specific heat capacity work. Figures below are as given in each item’s listing.

Expansion of solids, from demonstration to measurement

Apparatus	What it shows	What the listing specifies
Ball and Ring Apparatus	A heated ball no longer passes through the ring	Brass ball 25 mm in diameter and brass ring, each on its own wooden handle
Ball and Ring with Chain	The same effect, with the parts kept together	Brass ball 25 mm in diameter joined to the ring by a chain
Bar and Gauge Apparatus	Linear and superficial expansion	Iron bar on a support rod with wooden handle; gauge with a cut-out and holes that pass the bar endways when cold but not when hot
Bar Breaking Apparatus	The force exerted by expansion or contraction	Cast iron frame 340 x 120 x 100 mm holding a stout iron bar with a tension nut; ten cast iron breaking bars supplied
Bi-Metal Compound Strips	Unequal expansion of two metals	Two strips of different metals riveted together on an insulated handle; bends on heating and returns to shape on cooling
Linear Expansion Apparatus	Expansion read on a scale	Bar on two cast metal uprights moves a friction pointer along a 0 to 90 degree scale; bars of aluminium, brass and iron supplied
Linear Expansion Apparatus (Gunther)	Coefficient of linear expansion	Brass and copper rods, each 500 x 6 mm, in a glass steam jacket; spherometer reading to 0.005 mm at one end, contact screw at the other, and terminals to signal contact electrically; 600 x 125 x 150 mm overall

The first five items are qualitative: they show that expansion happens and how strongly. The Linear Expansion Apparatus adds a scale, and the Gunther apparatus measures the change in length to 0.005 mm. A half turn of its jacket brings the other rod into contact with the spherometer, so brass and copper can be compared without dismantling the setup.

Thermoelectric items

Item	What the listing specifies
Thermocouple	One copper and one constantan wire, each about 305 mm long, twisted and brazed together, to show the production of a thermoelectric e.m.f.
Thermopile	Four copper and four iron wires, each 125 mm long, joined to form seven junctions, four on one side and three on the other, with brass connections on the outer wires
Thermo Pile 12 Pairs	12 pairs of bismuth and antimony couples in series in an annular metal ring, with a polished conical funnel to focus radiant heat on the hot junctions; on a cast metal base; terminals for connection

All three demonstrate the Seebeck effect, which is named on the 12-pair thermopile’s listing. The thermocouple shows it with a single junction, and the two thermopiles add junctions in series. The bismuth-antimony pile, with its funnel, is the one built to respond to radiant heat.

Rivets for specific heat work

The Rivets listing covers packs of 500 g in aluminium, brass, copper, iron and lead, for specific heat capacity experiments. They are usually heated and transferred to a calorimeter, and the calorimeters are listed under Heat Capacity and Heat Conduction.

Related ranges

This range sits under Heat & Thermodynamics. The steam generator and other steam items are listed under Energy Transfer, and the expansion of liquids and absolute expansion of mercury apparatus are under Heat Capacity and Heat Conduction. Galvanometers for reading thermocouple output are listed under Meter and Radiations.

Questions buyers ask

What is the difference between the two ball and ring sets?
In the Ball and Ring Apparatus the ball and ring are on separate wooden handles. In the Ball and Ring with Chain the ball is attached to the ring by a chain. Both use a 25 mm brass ball.

How many breaking bars come with the bar breaking apparatus?
Ten cast iron breaking bars are supplied with the frame.

Which apparatus measures the coefficient of linear expansion?
The Linear Expansion Apparatus (Gunther), with its spherometer reading to 0.005 mm and two 500 mm rods of brass and copper in a glass steam jacket.

Which thermopile suits radiant heat?
The Thermo Pile 12 Pairs. Its polished conical funnel focuses radiant heat on the hot junctions and shields them from air currents.

Request a quotation

Send the item names and quantities through the contact page. For the rivets, state the metals and number of 500 g packs; for jacketed apparatus, say whether a steam generator is needed on the same order.