Quick Answer: Hare's Tube Apparatus compares the densities of two liquids by raising them in a three-limbed tube by suction and reading the column heights on a 45 cm metre scale with zero at the bottom.
Last updated: October 2026
Key Features
Three-limbed tube mounted on a polished stand
45 cm metre scale with zero at the bottom
Ratio of column heights gives relative density or specific gravity
Supplied without rubber tube and pinch cock
Technical Specifications
Specification
Value
Tube arrangement
Three-limbed tube
Stand
Polished stand
Scale
Metre scale, 45 cm
Scale zero
At the bottom
Rubber tube and pinch cock
Not supplied
About This Product
The two lower tube ends dip into the test liquids, gentle suction through the central limb lifts both columns, and once they are steady each height is read from the bottom zero so the ratio can be worked out. Properties of Matter practicals use it to show pressure balance in connected columns as well as relative density.
Frequently Asked Questions
Q1. Are a rubber tube and pinch cock included? No. The apparatus is supplied without rubber tube and pinch cock, so these are arranged separately.
Q2. What scale is fitted? A 45 cm metre scale mounted with its zero at the bottom, so both liquid-column heights are read from a common reference.
Q3. Can the liquids be drawn up by mouth? Not for unknown, toxic, volatile or corrosive liquids; a suction bulb or other approved suction arrangement should be used under supervision.
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