Meniscus Measurement
Meniscus Measurement - Related Videos
02:46
Uncertainty in Measurement: Reading Instruments
0 Views •
2020
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
07:06
Destabilization of the Medial Meniscus and Cartilage Scratch Murine Model of Accelerated Osteoarthritis
0 Views •
Cited by 2 •
2022
The present protocol describes the controlled microblade scratches on the surface of the articular cartilage after destabilizing the mouse knee by cutting the medial miniscotibial ligament. This animal model presents an accelerated form of osteoarthritis (OA) suitable for studying osteophyte formation, osteosclerosis, and early-stage pain.
14:36
Scientific Measurement and Lab Skills - Student Protocol
0 Views •
2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Measuring Diameter and CircumferenceExpand Error can be introduced in any experiment, even when the technique is performed carefully and correctly. It is essential to critically examine your experimental methods when performing any lab exercise in order to understand and evaluate uncertainty. In this part of the lab, you'll determine a procedure for measuring the circumference of different glassware and then assess sources of error in...
08:51
Understanding Concentration and Measuring Volumes
0 Views •
2023
Solutions are utilized to some degree in almost all biological research applications. Therefore understanding how to measure and manipulate them is imperative to any experiment. In this video, concepts in preparing solutions are introduced. Solutions consist of a solute dissolved in solvent to yield a homogeneous mixture of molecular substances. Solutions are generally identified by their components and corresponding concentrations. Concentrated solutions are diluted through various...
07:22
Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives
0 Views •
Cited by 7 •
2017
Optimized sampling protocols and the development of new wipe materials can be facilitated by standardized measurements of collection efficiency from wipe-sampling. Our approach for sampling trace explosives uses an automated device to control speed, force, and distance during wipe-sampling followed by extraction of collected explosives.
FAQs
Surface tension shapes the liquid surface into a curve rather than a flat line. For most aqueous liquids, this curve is concave, creating a distinct lowest point that serves as the reference for the volume reading. Recognizing this shape prevents the observer from selecting an inappropriate part of the liquid surface when matching it to the calibration scale.
The observer should position their eyes level with the liquid surface before reading the vessel. Viewing the meniscus from above or below changes its apparent position relative to the calibration marks, producing parallax error. Keeping the viewing angle consistent makes readings more reliable and allows measurements from different observations or experiments to be compared.
A concave surface has a central low point that provides a consistent reference for reading liquid volume. Aligning this lowest point with the appropriate calibration mark reduces ambiguity caused by the curved edges of the liquid. Using the same reference point across measurements supports consistent preparation of biological solutions and reagents.
These vessels provide calibrated reference marks that connect the observed liquid level with a volume value. The measurement depends on matching the meniscus to those markings, regardless of whether the vessel is a graduated cylinder, pipette, or burette. Selecting a calibrated vessel allows the measured volume to be incorporated into solution preparation, dilution, or assay procedures.
Place the liquid in a calibrated vessel, allow the surface to be viewed clearly, and position the eyes level with the meniscus. Identify the lowest point of the concave surface and align it with the relevant calibration mark. Recording the reading using this consistent sequence helps limit parallax and improves repeatability.
A volume reading determines how much liquid enters a solution, dilution series, culture medium, or assay reagent. If the observed volume is inconsistent, the calculated concentration may also be affected, which can influence biological results. Careful readings therefore support reproducibility by making the liquid volumes used across related preparations more consistent.
Biological laboratory work uses these readings when preparing solutions, making dilution series, producing culture media, and assembling assay reagents. Each application requires a measured liquid volume that can be related to a target preparation. Consistency at the reading stage helps ensure that later concentration calculations and experimental comparisons are based on dependable volume measurements.