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Smart Materials - Thermosmart Thermal Conductivity Bar

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Smart Materials - Thermosmart Thermal Conductivity Bar

The thermal conductivity set comprises four metal bars that can be used to demonstrate the differences in thermal conductivity between the different materials.

Availability: In Stock.

Code 1+ 5+
2067
incl VAT
£26.95
£32.34
£24.95
£29.94
OR

The thermal conductivity set comprises four metal bars held firmly together in parallel with a plastic rigid carrier. The carrier can be placed into a liquid to demonstrate the differences in thermal conductivity between the different materials.

The metals are copper, aluminium, brass and steel. Each bar has a Liquid Crystal temperature sensitive strip attached and its conductivity value marked on the back of the carrier. The liquid crystal strips have 8 boxes and change to a green colour at about 40°C.

The thermochromic Liquid Crystal used in these Conductivity Bars shows temperatures in the range 35°C to 45°C. The lowest temperature indication is a coppery red colour at 33°C and the hottest is a blue colour at over 45°C The 35°C to 45°C appears in green.

When cooler than about 30°C, the crystals in the film are solid and do not show any colour. At above about 50°C they melt and also show no colour. However, behind the film is a black backing sheet and so the film appears black. Between these temperatures something interesting happens. The crystals are in a liquid crystal state called a mesophase or liquid crystal phase. At these temperatures the crystals line up, or polarize, creating optical effects caused by Bragg diffraction. When these are placed on the black background, different colours of the visible spectrum can be seen at different temperatures.

At the top of each bar is an area large enough to be touched by a fingertip. This is an important confirmation to the student of what is happening, as they can feel the change in temperature and the differences between each metal.

Some discolouration will occur to the parts of the bars that have been immersed. The steel is zinc plated, the aluminium is anodized and the brass and copper are coated with an acrylic lacquer. The bars should be wiped dry with a soft cloth after each use and stored away from direct sunlight. NEVER apply direct heat such as a Bunsen flame to the bars. Immerse only the exposed metal ends in freshly boiled water. DO NOT immerse the plastic cradle or the thermochromic liquid crystal strips. DO NOT continue to heat the water; it should be BELOW BOILING POINT. Never use solvent or abrasive cleaners.

Features:

  • These bars can be used to demonstrate the differences in thermal conductivity between the different materials.
  • The metals are copper, aluminium, brass and steel.
  • Each bar has a Liquid Crystal temperature sensitive strip attached and its conductivity value marked on the back of the carrier.

Contents:

  • 1 x Thermal Conductivity Set.

Dimensions:

  • Length: 203mm.
  • Width: 55mm.

Resources:

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