Safety and model limitations
The fictional initial apparatus and contents have a mass of 120.0 g. The gas-amount slider chooses a hypothetical portion of matter redistributed as gas. In closed accounting, all gas stays within the modeled boundary; in open accounting, that mass leaves the region measured on the balance. All matter is still counted when outside gas is included. The model ignores uncertainty, spillage, gas remaining dissolved and air-flow effects.
1. Choose one variable
Starting total: 120.0 g
Measured inside boundary: 120.0 g
Gas outside boundary: 0.0 g
Accounted total: 120.0 g
2. Compare model records
Compare two trials with the same initial conditions and gas amount but different boundaries. Explain precisely what the scale counts in each one.
| Trial | Boundary | Gas formed (g) | Measured inside (g) | Gas outside (g) | Accounted total (g) |
|---|
No records yet.
3. Explain, question and correct
Extended question: If a real balance has an uncertainty of ±0.2 g, could you confidently distinguish a 0.1 g difference? Explain.