Newton’s Law of Cooling
Product Code : SCL-EAE-11213
Quick answer: The Newton's Law of Cooling apparatus is a double-walled copper calorimeter used to verify that the rate of cooling of a hot liquid is proportional to its temperature excess over the surroundings. Students record temperature against time and plot the cooling curve. It has a 200 mL inner copper vessel, an insulated lid and a brass stirrer. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Component | Specification |
|---|---|
| Inner vessel | Copper calorimeter, 200 mL |
| Outer vessel | Copper container enclosing the calorimeter |
| Lid | Insulated composite lid with rubber grommets |
| Thermometer holders | 2 perforated rubber stoppers |
| Stirrer | Brass wire loop with insulated handle |
Thermometers are not in the listed contents; add them to the enquiry if needed.
How the Newton's law of cooling experiment is done
Newton's law of cooling states that, for small temperature differences, the rate of loss of heat of a body is proportional to the difference between its temperature and that of its surroundings: dT/dt = -k (T - Ts). The double wall shields the calorimeter from draughts and room convection, so the cooling depends mainly on the temperature excess.
- Place the outer container on a steady bench and fit the inner calorimeter inside it.
- Fill the inner vessel with hot water, fit the lid and insert a thermometer through one stopper.
- Use the second stopper for a thermometer that reads the temperature of the enclosure.
- Stir gently and record the water temperature at regular intervals, such as every minute, as it cools.
- Plot temperature against time, then rate of cooling against temperature excess.
The cooling curve falls steeply at first and then more slowly. A graph of rate of cooling against temperature excess is a straight line through the origin, which verifies the law. Comparing the cooling times of water and another liquid in the same vessel gives the specific heat of that liquid by the method of cooling.
Key features
- Concentric double-wall copper design that shields the calorimeter from draughts
- 200 mL copper inner calorimeter for quick, even heat transfer
- Brass wire loop stirrer with insulated handle for uniform liquid temperature
- Two rubber stoppers hold thermometers without glass-to-metal contact
- Insulated lid limits evaporative cooling during readings
Documentation and supply
A step-by-step practical guide is supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Newton's law of cooling 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.
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The full range is in the Electrical and Electronics section of the Physics Lab range.
Frequently asked questions
What does the Newton's law of cooling apparatus verify?
It verifies that the rate of cooling of a liquid is proportional to its temperature excess over the surroundings, using a cooling curve and a graph of rate against excess temperature.
Can the apparatus be used to find the specific heat of a liquid?
Yes. By comparing the cooling times of equal volumes of water and the liquid through the same temperature range, the specific heat of the liquid is found by the method of cooling.
What is the price of the Newton's law of cooling apparatus?
Prices are not published on the website. Add the Newton's law of cooling apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-EAE-11213 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Newton's law of cooling apparatus?
Yes. Lab Exports manufactures the Newton's law of cooling apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-EAE-11213.
Request a quote
Email [email protected] with the house code SCL-EAE-11213 and the quantity, or add the Newton's law of cooling apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
