PSIG a PSIA

Converti tra PSIG e PSIA con precisione usando la pressione atmosferica locale. Gratis, veloce, per ingegneri e tecnici.

PSIG a PSIA

Converti tra PSIG e PSIA con precisione usando la pressione atmosferica locale. Gratis, veloce, per ingegneri e tecnici.

Precision: 3

PSIG (Gauge pressure)

Gauge pressure relative to ambient air.

PSIA (Absolute pressure)

Absolute pressure referenced to a perfect vacuum.

Atmospheric pressure (P_atm) in psi

Tip: PSIA = PSIG + P_atm.

Quick presets

Formula: PSIA = PSIG + P_atm

Quick Engineering Answer (GEO & AEO)

How to Convert PSIG to PSIA (Quick Direct Answer)

To convert PSIG (Pounds per Square Inch Gauge) to PSIA (Pounds per Square Inch Absolute), add the local atmospheric pressure (P_atm) to the gauge pressure:

PSIA = PSIG + P_atm | At Sea Level: PSIA = PSIG + 14.6959 psi

• 0 PSIG at sea level = 14.7 PSIA (standard atmospheric pressure).
• 100 PSIG at sea level = 114.7 PSIA.
• 125 PSIG at sea level = 139.7 PSIA.
• 150 PSIG at sea level = 164.7 PSIA.

Come PSIG a PSIA funziona

Pressure measurement is critical across industrial automation, HVAC/R engineering, aerospace, pneumatics, and chemical processing. Understanding the exact distinction between gauge pressure (PSIG) and absolute pressure (PSIA) prevents catastrophic equipment miscalibrations, piping failures, and safety hazards.

1. Understanding PSIG vs PSIA

PSIG (Pounds per Square Inch Gauge) measures pressure relative to ambient atmospheric pressure. A standard pressure gauge open to room air reads 0 PSIG because atmospheric air presses equally on the inside and outside of the gauge sensor diaphragm.

PSIA (Pounds per Square Inch Absolute) measures pressure relative to a perfect, complete vacuum (0 PSIA). Because Earth's atmosphere exerts weight, air at sea level pushes down with approximately 14.6959 psi (14.7 psi). Therefore, a vessel at 0 PSIG contains 14.7 PSIA of absolute pressure.

2. The Conversion Formula

The mathematical relationship is direct and linear:

PSIA = PSIG + Local Atmospheric Pressure (P_atm)

Conversely, to convert PSIA back to PSIG:

PSIG = PSIA - Local Atmospheric Pressure (P_atm)

3. Impact of Altitude & Atmospheric Pressure Variations

Standard sea-level atmospheric pressure is defined as 14.6959 psi (101.325 kPa or 1 atm). However, atmospheric pressure decreases as elevation above sea level increases. For example:

Sea Level (0 ft): P_atm ≈ 14.7 psi
Denver, CO (5,280 ft): P_atm ≈ 12.2 psi
High Altitude (10,000 ft): P_atm ≈ 10.1 psi

Our calculator allows entering custom local atmospheric pressure or choosing altitude presets so your PSIG to PSIA conversions remain 100% accurate anywhere on Earth.

Domande frequenti

14.7 PSIA è uguale a 0 PSIG?

Sì—in condizioni standard al livello del mare, un sistema alla pressione atmosferica legge ≈14.7 PSIA e 0 PSIG.

PSIA e PSIG sono la stessa cosa?

No. PSIA è assoluta (riferimento al vuoto). PSIG è relativa/manometrica (riferimento all’ambiente). Usa PSIA in termodinamica e quando l’altitudine conta.

Che cosa significa 14.7 PSIA?

È la pressione assoluta al livello del mare in condizioni standard: l’aria esercita 14.7 libbre per pollice quadrato sopra il vuoto.

14.7 PSIA è pressione atmosferica?

È la riferimento standard più usato per il livello del mare. La pressione atmosferica reale varia con il meteo e l’altitudine.