Charles’ Law Apparatus – Irwin Gratnells SmartCase of 10

The Irwin Charles’ Law Apparatus SmartCase of 10 provides a clear and reliable way to demonstrate one of the fundamental gas laws: that the volume of a fixed mass of gas is directly proportional to its absolute temperature, provided the pressure remains constant. Designed specifically for school physics teaching, this set is ideal for class practicals and demonstrations.

Each apparatus is mounted on a sturdy anodised stand and comprises a Jolly-type air thermometer with a clearly marked millimetre scale (0–200mm). A sealed capillary tube and air reservoir are securely held in place using spring clips, with fine adjustment made via a vertical clamping rod. A built‑in thermometer with a range of –10 °C to 100 °C allows pupils to directly compare temperature changes with volume changes.

The apparatus is supplied complete with a levelling tube, Jolly air thermometer, biodegradable oil, and syringe, allowing the capillary tube to be prepared for use. All components are clearly visible, making it easy for pupils to take readings and plot graphs relating volume to temperature. Each unit measures approximately 33.5cm high × 40cm wide × 1.5cm deep.

This set is delivered in a durable Gratnells SmartCase containing 10 complete Charles’ Law apparatus, providing safe storage, easy transport, and efficient distribution for classroom use.

Key Features

• Complete Charles’ Law demonstration apparatus
• Clearly shows the relationship between gas volume and temperature
• Jolly-type air thermometer with 0–200mm scale
• Integrated thermometer, range –10 °C to 100 °C
• Spring clips and adjustment rod for secure positioning
• Supplied with biodegradable oil and syringe
• Robust anodised stand for long-term classroom use
• Pack of 10 supplied in a Gratnells SmartCase
• Optional refill set available separately

Ideal for School Physics Lessons

Perfect for KS4 and KS5 physics lessons, this Charles’ Law SmartCase set enables practical investigations that reinforce key theoretical concepts. It is ideal for:

• Demonstrating Charles’ Law experimentally
• Plotting graphs of volume against temperature
• Introducing the concept of absolute zero
• Supporting understanding of the Kelvin temperature scale
• Providing hands-on experience with gas behaviour under constant pressure

Clear, robust, and classroom‑ready, the Irwin Charles’ Law Apparatus SmartCase of 10 is an excellent resource for effective teaching of gas laws and thermal physics in secondary education.