Charles’ Law Prefilled Apparatus – Irwin

The Irwin Charles’ Law Prefilled Apparatus provides a clear, reliable, and engaging way to demonstrate how the volume of a fixed mass of gas changes in proportion to its absolute temperature. Ideal for secondary school science labs, this apparatus offers a simple and safe setup for teaching key principles of thermal physics.

This high‑quality unit features a traditional Jolly’s apparatus mounted on a sturdy anodised stand with a millimetre‑marked scale. Spring clips secure the air reservoir, while fine adjustments are made using the integrated vertical clamping rod. Each set includes a levelling tube and a Jolly air thermometer (-10°C to +100°C). The capillary tube comes prefilled with oil beads, ensuring safe operation without the use of mercury.
Dimensions: Height 33.5cm × Width 40cm × Depth 1.5cm.

Key Features

• Demonstrates Charles’ Law clearly and accurately
• Includes Jolly’s apparatus mounted on an anodised stand
• 0–200mm capillary scale for precise measurements
• Integrated -10°C to 100°C thermometer
• Oil bead prefilled for safe use (no mercury)
• Supplied with levelling tube and secure spring clips
• Strong backing plate with clear scale markings
• Optional refill set available (Code: 80857)
• Instructional video available at: www.ipcirwin.com/charles-law-apparatus

Ideal for School Science Lessons

This apparatus is perfect for teaching KS3, GCSE, and A‑Level physics, allowing students to practically investigate how gas volume changes with temperature at constant pressure. It supports hands‑on learning and reinforces understanding of the Kelvin scale, absolute zero, and gas behaviour.

• Enables students to measure volume changes through the movement of the oil bead
• Ideal for plotting volume vs. temperature graphs and determining absolute zero
• Supports lessons on thermal expansion, particle theory, and gas laws