Joule's Mechanical Heat Experiment Apparatus
Product Code : EL-H-10404
Quick answer: Joule's Mechanical Heat Experiment Apparatus demonstrates the mechanical equivalent of heat: work done in turning vanes in water is converted into heat by friction. A cast aluminium cylinder turns on a cast metal pedestal, driven by slotted weights and cord over two pulleys, and the water temperature rises within two to three minutes. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Item | Specification |
|---|---|
| Rotating cylinder | Cast aluminium, turning freely on a cast metallic pedestal |
| Mechanism | Vanes on the axle stir the water, converting kinetic energy to heat by friction |
| Vessel | Copper, water-filled |
| Base | Wooden, with sliding box and thermometer clamp |
| Pulleys | Two, on an aluminium sliding bracket |
| Supplied | Two sets of slotted weights and cord; without thermometer |
How the mechanical equivalent of heat is shown
James Joule showed that a given amount of mechanical work always produces the same amount of heat. In this apparatus the falling slotted weights do work W that turns the vanes in the water-filled copper vessel; friction between the vanes and the water converts that work into heat H, raising the water temperature. The ratio J = W / H is the mechanical equivalent of heat, about 4.2 joules per calorie.
- Fill the copper vessel with a weighed quantity of water and fit a thermometer in the clamp on the wooden base.
- Pass the cord over the two pulleys on the sliding bracket and hang the slotted weights.
- Record the starting water temperature.
- Let the weights drive the cylinder and vanes for two to three minutes, noting the total distance through which they descend.
- Record the final temperature and compare the work done with the heat gained by the water and vessel.
Work done is W = m g h for weights of mass m falling a total height h; heat gained is H = (Mw cw + Mv cv) delta T for the water and the copper vessel. In a class demonstration the key result is the clear temperature rise; in a quantitative practical students compare W and H to estimate J.
Key features
- Cast aluminium cylinder turning freely on a cast metallic pedestal
- Rotating vanes convert mechanical work into heat in the water by friction
- Water-filled copper vessel for a measurable temperature rise
- Wooden base with sliding box and thermometer clamp
- Two pulleys on an aluminium sliding bracket; two sets of slotted weights and cord supplied
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Joule's mechanical heat apparatus at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Heat products
- Constant Level Tank (EL-H-10403)
- Clement and Desormes Apparatus (EL-H-10405)
- Callendar and Barne's Apparatus (Continuous Flow) (EL-H-10402)
- Joule's Calorimeter (EL-H-10401)
- Lee's and Charlton's Apparatus (EL-H-10400)
- Searle's Thermal Conductivity Apparatus (EL-H-10399)
The full range is in the Heat section of the Physics Lab range.
Frequently asked questions
What does Joule's mechanical heat apparatus demonstrate?
The mechanical equivalent of heat: mechanical energy from the falling weights is turned into heat in the water through friction.
How quickly does the water warm up?
A measurable rise in water temperature appears after about two to three minutes of rotation.
Is a thermometer included?
No. A thermometer clamp is provided on the base, but the thermometer itself is not included.
What is the price of the Joule's mechanical heat apparatus?
Prices are not published on the website. Add the Joule's mechanical heat apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-H-10404 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Joule's mechanical heat apparatus?
Yes. Lab Exports manufactures the Joule's mechanical heat apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-H-10404.
Request a quote
Email [email protected] with the house code EL-H-10404 and the quantity, or add the Joule's mechanical heat apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
