Question

When is a perfect vacuum obtained?

• A. When gauge pressure is zero
• B. When atmospheric pressure is zero
• C. When molecular momentum is unity and atmospheric pressure is zero
• D. When both absolute pressure and molecular momentum are zero

Answer 1

Answer:

D. When both absolute pressure and molecular momentum are zero

A perfect vacuum is defined as a space with no particles of any state. However, it can be obtained when both absolute pressure and molecular momentum are zero.