Pressure unit equivalence: 1 ata (technical atmosphere, absolute) is approximately equal to which of the following?

Introduction / Context:Pressure units are numerous: atm, bar, Pa, torr, kgf/cm², and ata appear in data sheets and legacy equipment. Being able to translate between them prevents order-of-magnitude mistakes in sizing and safety calculations.

Given Data / Assumptions:

• Standard atmosphere: 1 atm = 101.325 kPa ≈ 760 torr ≈ 1.01325 bar.
• Technical atmosphere (ata, often written at): historically defined via 1 kgf/cm² (≈ 98.0665 kPa), but in many practice problems ata is treated as standard atmosphere when contrasting “absolute” vs. “gauge”.
• Intent here is to match the closest common equivalence from the listed options.

Concept / Approach:Among the options, 1 atm is the closest direct equivalence commonly used with “ata” in basic problem statements that highlight absolute pressure (psia/ata) versus gauge (psig/atg). The other choices are clearly incorrect by orders of magnitude or unit basis.

Step-by-Step Reasoning:

Verification / Alternative check:Many handbooks give 1 atm = 1.033 kgf/cm²; hence 1 kgf/cm² is slightly less than 1 atm. Therefore, the best equivalence in the list is 1 atm.

Why Other Options Are Wrong:

• 10 torr and 0.98 Pascal: Incorrect by large factors.
• 1 kgf/cm²: Close numerically but not equal.
• 1 bar: 1 bar = 100 kPa, about 0.987 atm; again not equal.

Common Pitfalls:Mixing absolute and gauge forms; assuming bar and atm are identical.

Final Answer:1 atm