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Three-way Taps (AQA A Level Biology)

Revision Note

Lára Marie McIvor

Written by: Lára Marie McIvor

Reviewed by: Lucy Kirkham

Apparatus & Techniques: Three-way Taps

  • Three-way taps can be used in conjunction with potometers and respirometers

  • They allow for repeat readings to be taken easily, eliminating the need for the apparatus to be reassembled each time

  • Potometers:

    • When used with a water reservoir they allow for the air bubble to be returned to the start of the tube by allowing water to enter the system

  • Respirometers:

    • The three-way tap can be used with a syringe to push the bead of coloured liquid back to the start

Three-way tap, downloadable AS & A Level Biology revision notes

The image above shows a respirometer set up with a three-way tap. The three-way tap allows for the drop of coloured liquid to be returned to the start of the ruler after each repeat of the experiment.

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    Author
    Reviewer
    Lára Marie McIvor

    Author: Lára Marie McIvor

    Expertise: Biology Lead

    Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.

    Lucy Kirkham

    Author: Lucy Kirkham

    Expertise: Head of STEM

    Lucy has been a passionate Maths teacher for over 12 years, teaching maths across the UK and abroad helping to engage, interest and develop confidence in the subject at all levels.Working as a Head of Department and then Director of Maths, Lucy has advised schools and academy trusts in both Scotland and the East Midlands, where her role was to support and coach teachers to improve Maths teaching for all.