Pressure Units Guide: Convert PSI, Bar, Pascal & Tire Inflation
Comprehensive reference guide explaining pressure measurement units including PSI, Bar, KPa, and Standard Atmosphere for tire inflation and engineering.
1. Common Pressure Unit Conversion Formulas
Pressure measures force applied perpendicular to a surface area. While the SI base unit is Pascal (Pa), everyday applications rely heavily on PSI and Bar:
- 1 Bar (บาร์) = 14.5038 PSI (ปอนด์ต่อตารางนิ้ว) = 100,000 Pascal (Pa) = 100 kPa
- 1 PSI (Pound per Square Inch) = 0.0689476 Bar = 6,894.76 Pascal (Pa)
- 1 atm (Standard Atmosphere) = 1.01325 Bar = 14.6959 PSI = 101.325 kPa
2. Standard Tire Inflation Reference Table (PSI ↔ Bar)
| PSI (ปอนด์/ตร.นิ้ว) | Bar (บาร์) | kPa (กิโลปาสกาล) | Typical Usage |
|---|---|---|---|
| 30 PSI | 2.07 Bar | 206.8 kPa | Compact Sedan |
| 32 PSI | 2.21 Bar | 220.6 kPa | Standard Sedan / Crossover |
| 35 PSI | 2.41 Bar | 241.3 kPa | Light Truck / Van |
| 40 PSI | 2.76 Bar | 275.8 kPa | Heavy Load Pickup |