An audio guide provides the following instructions for calibrating a digital refractometer in a laboratory: 'First, ensure the prism surface is completely clean and dry. Before applying any test sample, place two drops of distilled water onto the prism to perform a zero calibration. Once the reading is confirmed at zero, wipe the lens with a lint-free tissue. Finally, apply the sample solution and record the refractive index.' Based on the transitional markers in the spoken instructions, in what chronological order should the technician perform these actions?
- 1Clean and dry the prism surface thoroughly
- 2Apply distilled water to perform a zero calibration
- 3Wipe the lens with a lint-free tissue
- 4Apply the sample solution and record the refractive index
Answer
Clean and dry the prism surface thoroughly → Apply distilled water to perform a zero calibration → Wipe the lens with a lint-free tissue → Apply the sample solution and record the refractive index
The chronological sequence is determined by the explicit transitional markers: 'First' indicates starting with cleaning the surface; 'Before [subsequent action]' introduces performing the zero calibration with distilled water; 'Once [condition met]' introduces wiping the lens after confirming calibration; and 'Finally' marks applying the actual sample solution as the concluding step.
Step-by-Step Solution
Key Concept
Chronological Sequencing and Transitional Markers in Spoken Instructions
Estimated Time:45s