Hare’s Apparatus
Product Code : SCL-POM-11179
Quick answer: Hare's apparatus compares the densities of two liquids by drawing them up two columns under the same reduced pressure and measuring the heights. It has a three-limbed tube on a polished stand with a 45 cm scale, zero at the bottom, divided in centimetres and millimetres. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Item | Specification |
|---|---|
| Tube | Three-limbed |
| Scale | 45 cm, divided in centimetres and millimetres, zero at the bottom |
| Mounting | Polished stand |
| Application | Comparison of the densities of two liquids |
| Spare tube | Available on demand |
The apparatus is supplied without the rubber tube and pinch cock.
How the Hare's apparatus experiment is done
The two outer limbs dip into beakers of the two liquids, and air is drawn out through the third limb. The pressure above both columns falls by the same amount, so atmospheric pressure pushes each liquid up until p0 - p = rho1 g h1 = rho2 g h2. The heights of the columns are therefore inversely proportional to the densities, rho1/rho2 = h2/h1. If one liquid is water, the ratio gives the relative density of the other liquid directly.
- Stand the apparatus upright and place a beaker of each liquid under one of the outer limbs, so that the limb ends dip below the surface.
- Fit a rubber tube with a pinch cock to the third limb.
- Draw out a little air through the rubber tube so that both liquids rise, then close the pinch cock.
- Read the height of each column above the liquid surface in its beaker on the 45 cm scale.
- Repeat at several different heights and average the ratio h2/h1.
Plotting the pairs of heights h1 against h2 gives a straight line whose slope is the density ratio, which reduces the effect of any single reading error. The method needs no balance and works for any two liquids that do not mix or react when drawn into the tube.
Key features
- Three-limbed tube: two limbs for the liquids and one for drawing out air
- 45 cm scale with zero at the bottom for direct height readings
- Centimetre and millimetre divisions for readings to the nearest millimetre
- Polished stand that keeps the tube and scale upright
- Spare tube available on demand
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 Hare's 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 Properties of Matter products
- Boyle's Law Apparatus (SCL-POM-11240)
- Lead Shots (SCL-POM-11113)
- Kinetic Theory Apparatus (EL-POM-10380)
- Fluid Pressure Apparatus, Hydraulic Press (EL-POM-10379)
- Force Pump (EL-POM-10378)
- Lift Pump (EL-POM-10377)
The full range is in the Properties of Matter section of the Physics Lab range.
Frequently asked questions
What does Hare's apparatus measure?
It compares the densities of two liquids from the heights of the columns they form under the same reduced pressure.
Are the rubber tube and pinch cock included?
No. The apparatus is supplied without the rubber tube and pinch cock, which are fitted to the third limb for the experiment.
What scale is fitted?
A 45 cm scale with zero at the bottom, divided in centimetres and millimetres.
What is the price of the Hare's apparatus?
Prices are not published on the website. Add the Hare's apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-POM-11179 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Hare's apparatus?
Yes. Lab Exports manufactures the Hare's apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-POM-11179.
Request a quote
Email [email protected] with the house code SCL-POM-11179 and the quantity, or add the Hare's apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
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