GCSE Biology (AQA)

331 videos | 14 hours

Calculating Areas of Colonies

Please subscribe to watch this video.

This, and all other videos, are included in our premium subscriptions.

Premium accounts get access to all videos.

Cell Biology Cell Structure

Calculating Areas of Colonies

2:11 Microorganisms and Measurements
Spec 4.1.1.6
Previous Aseptic Techniques Next Measuring Zones of Inhibition
  • The area of a bacterial colony in a Petri dish can be calculated using the formula for the area of a circle: A = ��r��.
  • The formula requires the radius of the colony, which can be derived by measuring the colony's diameter and dividing by two.
  • Measurements can be in millimeters or centimeters, affecting the unit of the area (mm�� or cm��).
  • Example calculation:
  • Measure the diameter of the colony (e.g., 10 mm).
  • Calculate the radius (e.g., 10 mm / 2 = 5 mm).
  • Insert the radius into the formula (�� �� 5�� = 78.5 mm��).
  • The calculated area for the example colony is 78.5 mm��.
  • It's important to know this calculation method for academic assessments.

Please subscribe to access these revision notes.

This, and all other video notes, are included in our premium subscriptions.

Premium accounts get access to all videos and revision notes.