SUMMARY
This discussion clarifies the measurement of vacuum in relation to atmospheric pressure, specifically addressing the range from 0 to -1 bar. It distinguishes between PSIG (gauge pressure) and PSIA (absolute pressure), explaining that gauge pressure uses atmospheric pressure as a baseline. A complete vacuum is defined as 0 PSIA, while underpressure and overpressure are defined based on deviations from atmospheric pressure. The terms are illustrated with practical examples of pressure measurements in various systems.
PREREQUISITES
- Understanding of PSIG (gauge pressure) and PSIA (absolute pressure)
- Basic knowledge of atmospheric pressure and its role in pressure measurements
- Familiarity with the concepts of underpressure and overpressure
- Knowledge of pressure measurement units, specifically bar
NEXT STEPS
- Research the differences between gauge pressure and absolute pressure in detail
- Explore the applications of PSIG and PSIA in various engineering fields
- Learn about pressure measurement techniques and instruments
- Investigate the implications of underpressure and overpressure in system design
USEFUL FOR
Engineers, technicians, and students in fields related to fluid dynamics, pressure systems, and instrumentation who seek to understand pressure measurement concepts and their practical applications.