Domain: Healthcare — Pharmacy
Target concept: Difference in Release Behavior between Effervescent Tablets and Conventional Tablets

Video generation prompt: Two identical transparent beakers containing still distilled water are placed side by side. A effervescent tablet is simultaneously added to the left beaker, and a regular tablet is added to the right beaker, with the subsequent changes observed.

Evaluation guide:
(i) Target concept: Differential gas evolution due to presence/absence of acid-base reactive pairs in tablet formulation.
Minimum mechanism: Water must act as solvent and reaction medium; effervescent tablet must contain dry, stable, yet water-activated CO₂-generating compounds; regular tablet must contain no volatile gas precursors and exhibit only solvation/diffusion-limited dissolution.
(ii)Storyline: Frame 0–1: Static wide shot showing two identical transparent beakers filled with still, clear water, aligned side-by-side under uniform lighting. Frame 2–3: Two tablets enter frame from top simultaneously: porous-textured effervescent tablet descends into left beaker; smooth-textured regular tablet descends into right beaker. Frame 4–10: Left tablet immediately emits continuous upward-rising bubbles from surface; right tablet shows no bubbles, no surface disruption, and retains solid integrity; both beakers remain fully visible, fixed in position, with stable lighting and unbroken water-beaker interfaces throughout.

Manual:
Experimental Procedure
1. Place two identical transparent cylindrical beakers side-by-side on a flat surface.
2. Fill each beaker with equal volume of still distilled water (clear, colorless, no bubbles).
3. Simultaneously drop one effervescent tablet into left beaker and one regular tablet into right beaker.
Observation of Experimental Phenomena
- Left beaker: Immediate, vigorous bubbling/fizzing from tablet surface; continuous gas bubble release; tablet retains shape while effervescing.
- Right beaker: No bubbling; tablet remains intact, slowly wets and may sink without disintegration.
Summary of Experimental Principles
Effervescent tablets contain acid-base reactants (e.g., citric acid + sodium bicarbonate) that rapidly generate CO₂ gas upon contact with water; conventional tablets lack these reactants and dissolve or erode passively without gas evolution.

Prompt Grounding rubric:
level_1: No transparent beakers appear at all, or only a single container is shown; no effervescent tablet or regular tablet is present; the liquid in either container is colored or cloudy rather than clear distilled water; or the containers are opaque so nothing inside can be seen.
level_2: A left and right container are both present, but at least one is not a clear beaker (e.g., a mug, flask, or frosted/opaque cup); or only one of the two tablets appears while the other position is empty; or the two containers sit far apart, stacked, or otherwise not set up for a direct side-by-side comparison.
level_3: Two matching transparent beakers of clear water sit beside each other; a rough-textured effervescent tablet sits in the left beaker and a smooth regular tablet sits in the right beaker, both intact and visible before dissolving, but the two tablet types are hard to tell apart by appearance, or one beaker sits noticeably behind, in front of, or at a different height than the other.
level_4: Everything above holds, and the two beakers are now level with each other and stay in their same left/right spots for the whole clip; the effervescent tablet's rough, pitted surface reads clearly distinct from the regular tablet's smooth, dense surface; neither tablet is submerged or added before the clip begins.
level_5: Everything above holds, and for the full clip the effervescent tablet remains identifiable in the left beaker by its porous texture and the regular tablet remains identifiable in the right beaker by its smooth texture; both beakers stay framed together under matching lighting so the pair is visible in one shot, and neither tablet is swapped, removed, or replaced after being placed.

Scientific and Causal Correctness rubric:
level_1: No causal difference between the two tablets is shown: e.g., both fizz the same way, both dissolve quietly with no bubbling anywhere, the effervescent tablet in the left beaker produces zero gas for the entire clip, or the regular tablet in the right beaker is the one that bubbles instead.
level_2: The effervescent tablet does eventually react, but not convincingly as a fast, sustained reaction: e.g., its bubbling only starts after a long delay following contact with the water, or the bubbling begins normally but cuts off partway through instead of continuing; or gas bubbles appear to rise from the open water rather than from the tablet's surface; or the regular tablet shows a few unexplained bubbles despite being non-reactive.
level_3: Soon after contact, the effervescent tablet in the left beaker gives off a steady stream of bubbles from its surface, while the regular tablet in the right beaker shows no bubbling and stays structurally whole; both are visible in the frame at the same time.
level_4: In addition to the above, the effervescent tablet keeps a recognizable tablet shape while fizzing rather than instantly breaking apart into foam; the regular tablet shows at most a slow surface wetting or slight darkening with no bubble formation; and no bubbles ever appear in the right beaker.
level_5: In addition to the above, the bubbles clearly originate at the effervescent tablet's surface and rise upward, growing and merging the way buoyant gas would; and the regular tablet shows no surface disturbance at all (no shimmer, no cloudiness) for the entire clip.

Spatiotemporal Consistency rubric:
level_1: One of the beakers vanishes or is swapped for a different container between shots; a tablet appears already inside the water with no visible drop or entry; the lighting flips abruptly between bright and dark with no visible cause; the scene suddenly cuts to a different zoom or angle that hides the moment of contact; or a beaker changes size or shape between frames.
level_2: A tablet jumps straight from the hand into the water with no visible falling motion; the water surface suddenly ripples with no tablet nearby to cause it; or the two beakers drift apart or overlap across the clip in a way that doesn't match how they started.
level_3: Both beakers stay visible and in place for the whole clip; each tablet's drop and entry into the water plays as one unbroken motion; the water is calm before the tablets go in and only ripples once a tablet touches it; neither beaker nor tablet flickers, stretches, or gets clipped out of frame.
level_4: On top of that, each tablet's fall looks governed by gravity rather than floating or hovering down; the bubbling from the effervescent tablet is continuous rather than starting and stopping erratically; and both beakers stay lit the same way as each other the whole time, with no beaker suddenly brightening, darkening, or shifting its reflection on its own.
level_5: On top of that, the falling tablets, the rising bubbles, and the water's ripple all read as smooth motion from one frame to the next with no stutter or freeze; neither beaker nor tablet visibly bends or warps; and the ripple that starts at each tablet's impact fades out naturally rather than snapping back to a still surface.