Read the buret.
Read the lowest point of the meniscus at eye level, then enter the volume in mL to two decimals.
Loading the interactive practice bench…
Read the lowest point of the meniscus at eye level, then enter the volume in mL to two decimals.
Loading the interactive practice bench…
Meniscus Mark is an independent browser practice tool for one precise laboratory skill: reading the volume shown by a 50 mL buret and, in the advanced task, subtracting an initial reading from a final reading to find the volume delivered. The scale, curve, expected answer and feedback are generated locally. There is no account, payment, cloud profile or answer upload.
The instrument is intentionally limited to a common teaching case: a vertical 50 mL buret, numbered downward, with 0.1 mL as the smallest printed graduation and a transparent aqueous liquid that forms a concave meniscus. That boundary matters. It prevents the game from pretending that every liquid, glassware design or laboratory procedure is read in exactly the same way.
A buret is different from many measuring containers because its printed values normally increase as you move down the tube. A liquid level lower on this scale therefore corresponds to a larger reading. Meniscus Mark draws every tenth-milliliter mark from 0.0 at the top through 50.0 at the bottom. The same mathematical conversion places the liquid curve, so a reading can never be paired with a contradictory visual position.
For the transparent aqueous case shown here, look at the lowest point in the center of the concave curve. The edges rise against the glass; they are not the reading point. Learn mode adds a horizontal eye line through the curve’s lowest point. That guide is a visual reminder of the observation position, not a claim that a browser drawing can reproduce every real optical effect.
Keep your eye at the same height as the meniscus on real equipment. Looking from above or below creates parallax: the curve appears shifted against the graduation marks. A responsive screen cannot enforce your physical viewing angle, so the game isolates scale interpretation while the guide explains why eye level still matters at a laboratory bench.
The smallest printed interval in this practice scale is 0.1 mL. Read the two surrounding tenth marks first, then estimate the meniscus position between them to the hundredth place. If the lowest point is between 24.2 and 24.3 mL, a reasonable displayed reading could be 24.27 mL. Enter two decimal places so the estimated digit remains visible.
Values such as 0.00, 0.10, 10.50, 24.27 and 49.90 are explicit release checks in the engine. They test both ends of the instrument, exact tick positions, trailing zeros and an in-between estimate. Formatting 10.50 as 10.5 would describe the same number, but the extra zero communicates the precision expected for this exercise.
Feedback separates several mistakes rather than displaying only a red mark. It can identify an upside-down reading of the downward scale, a tenth-place answer that omitted the estimated digit, a likely choice of the raised meniscus edge, or a different review case. The explanation then states the expected value; it does not silently advance before you can compare your reasoning.
In Delivered volume, the left instrument is the initial reading and the right instrument is the final reading. Because the buret scale increases downward, dispensing liquid usually moves the displayed level to a larger reading. Calculate final reading minus initial reading. For example, an initial reading of 10.50 mL and a final reading of 24.27 mL gives 13.77 mL delivered.
Read both instruments to the hundredth place before subtracting. Do not round either one to a whole tenth first; premature rounding can change the final hundredth. The game keeps each displayed reading intact, performs one subtraction and rounds the final difference to two decimal places. A dedicated error category flags addition in place of subtraction.
These arithmetic exercises explain the relationship between displayed readings. They do not replace preparation, rinsing, leak checks, air-bubble removal, funnel removal, temperature control, endpoint technique, chemical compatibility, personal protective equipment or waste procedures. Follow your instructor, laboratory protocol and equipment documentation for those tasks.
Learn cycles through deliberate reference values and displays the eye-level guide. Quick 10 creates ten deterministic questions from the visible replay seed and closes with an accuracy summary. Endless continues until you choose Finish session. Direct reading and Delivered volume can be selected independently, so the experimental comparison does not hide an advanced exercise behind a separate page.
The score, streak and accuracy update only in the browser. The last five finished sessions store the seed, mode, task type, number completed and aggregate accuracy in local storage. Individual answers are not placed in history. Replay uses the same seed to rebuild the same sequence, while New seed starts a different sequence. Clearing local history removes those summaries.
The large text field works with a physical keyboard, and its decimal input mode opens a numeric keyboard on supported phones. A visible touch keypad is also provided. Enter submits from a keyboard. Every task uses semantic buttons, labels, live feedback and an SVG with an accessible description rather than relying on an unlabeled canvas.
Dark, opaque or strongly colored liquids can require a different reading convention or special aid because the lower curve may not be visible in the same way. Mercury forms a convex meniscus and is not represented here. Some burets have different capacity, graduation spacing, class, tolerance, color bands or digital readouts. Meniscus Mark must not be used to infer those specifications.
The on-screen instrument is a learning model, not calibrated glassware. Pixel rendering, display scaling and browser zoom are not metrology. The accepted answer describes the generated exercise, not the accuracy of a real volume delivery. Verify actual work with suitable equipment, the manufacturer’s markings and the procedure assigned by a qualified teacher or supervisor.
Before Allow is selected, the site makes no request to Google. Selecting No thanks keeps Google Analytics disabled. After an explicit Allow choice, the loader permits only two parameter-free event names: practice_started and practice_completed. The event interface accepts no object and therefore has no path for sending a reading, answer, score, streak, error type, seed, task type, mode or history item.
The optional analytics choice is stored separately from game history and can be withdrawn from the Privacy page. The game itself needs no cookies, login or remote database. The generated abstract illustration, application bundle, manifest and trust pages are served from the same site; the only conditional third-party request is the consent-gated analytics loader.
The search phrase “how to read a buret” describes a long-standing educational need rather than a proprietary game. Meniscus Mark uses original React code, SVG geometry, seeded questions, explanations, editorial art and interface copy. It does not copy Chem21’s value array, Adobe Animate file, graphics, canvas size, controls or wording, and it is not affiliated with Chem21 or another tutorial provider.
For a short method, open How to play. Read About for the authorship boundary, Privacy for local storage and consent, Terms for educational and safety limits, or Contact for the verified public issue route. Return to the practice bench at any time.