Thermal Expansion in Solids and Liquids Manufacturer,Supplier and Exporter in India
Product Code : EL-TWL-9183
Jlab Export is a leading Thermal Expansion in Solids and Liquids Manufacturer,and suppliers in India
This set measures how solids and liquids expand when heated. A dilatometer gives the linear expansion of brass, iron, copper, aluminium, borosilicate glass and quartz glass against temperature. A pycnometer gives the volume expansion of liquids such as water, glycerol and ethyl acetate. Students also test how the change in length depends on the starting length.
Specifications
| Linear expansion | Measured with a dilatometer |
| Solids tested | Brass, iron, copper, aluminium, borosilicate glass, quartz glass |
| Volume expansion | Measured with a pycnometer |
| Liquids tested | Ethyl acetate, methylated spirit, olive oil, glycerol, water |
| Length study | Change in length against overall length, aluminium |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Expansion Experiments for Physics Students
For each rod, students record the length change on the dilatometer as the temperature rises, read on a Thermometer. The slope of ΔL against ΔT, divided by the starting length, gives the linear expansivity α = ΔL / (L ΔT). Brass, copper and aluminium expand far more than quartz glass, which hardly moves. Aluminium rods of different lengths show that ΔL grows in proportion to L.
In the liquid test, the pycnometer is filled at one temperature and warmed in a Water Bath. The liquid that overflows is found by weighing on a Digital Balance. This gives the apparent expansion, because the glass expands too. Adding the cubical expansivity of the glass gives the real value: γ real = γ apparent + γ glass.
Frequently Asked Questions
What is the difference between apparent and real expansion of a liquid?
Apparent expansion is what you see in the glass vessel. The vessel expands as well, so the liquid’s real expansion is larger. Real expansivity equals apparent expansivity plus the cubical expansivity of the glass.
Why is quartz glass included?
Quartz glass has a very small expansion coefficient. Testing it beside brass or aluminium shows the full spread between materials and explains why quartz and borosilicate glassware stand sudden heating better than ordinary glass.
How are linear and cubical expansivity related?
For a solid that expands equally in all directions, the cubical expansivity is about three times the linear expansivity, γ ≈ 3α. Liquids have no fixed length, so only their volume expansion is measured.
Does water expand evenly?
No. Water contracts from 0 to about 4 °C and expands above that, and its expansion grows with temperature. Over a normal heating range from room temperature it expands much less than ethyl acetate or methylated spirit.
Is any care needed with the liquids?
Yes. Ethyl acetate and methylated spirit are flammable, so heat them only in a water bath and never over a flame. Work in a ventilated room and keep the bottles closed when not in use.
Other Heat Expansion Apparatus
- Linear Expansion Apparatus (metal rod heated in a steam chamber)
- Expansion of Liquid Apparatus
- Expansion Apparatus (simple version for comparing common metals)
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Last updated: 6 November 2026
