Pressure Calculator
Pressure, force & area calculator
Calculation Mode
Pressure Calculation
All Pressure Units
Pressure Level
Pressure Comparison
Force vs Area
Common Pressure References
Common pressure values in everyday life and science
| Reference | Pressure (Pa) | Pressure (psi) | Pressure (atm) | Category |
|---|
Pressure Facts
Atmospheric Pressure
Standard atmospheric pressure at sea level is 101,325 Pa (14.7 psi)
Tire Pressure
Car tires typically require 30-35 psi (207-241 kPa)
Blood Pressure
Normal blood pressure is about 120/80 mmHg (16/10.7 kPa)
Water Pressure
Water pressure increases by about 9.8 kPa per meter of depth
Understanding Pressure
What is Pressure?
Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. It's a fundamental concept in physics and engineering.
- Formula: P = F/A (Pressure = Force / Area)
- SI Unit: Pascal (Pa), where 1 Pa = 1 N/m²
- Scalar quantity: Has magnitude but no direction
- Symbol: P or p
Pressure Formulas
Three related formulas for pressure calculations:
- Find Pressure: P = F/A
- Find Force: F = P × A
- Find Area: A = F/P
- Fluid Pressure: P = ρgh (density × gravity × height)
Unit Conversions
Common pressure unit conversions:
- 1 atm = 101,325 Pa = 14.7 psi = 1.013 bar
- 1 bar = 100,000 Pa = 14.5 psi
- 1 psi = 6,895 Pa = 0.068 atm
- 1 mmHg = 133.3 Pa = 0.0193 psi
- 1 kPa = 1,000 Pa
- 1 MPa = 1,000,000 Pa
Types of Pressure
- Absolute Pressure: Total pressure including atmospheric pressure
- Gauge Pressure: Pressure above atmospheric pressure
- Atmospheric Pressure: Pressure of Earth's atmosphere (101,325 Pa at sea level)
- Hydrostatic Pressure: Pressure in fluids due to gravity (P = ρgh)
- Dynamic Pressure: Pressure due to fluid motion
Real-World Applications
- Engineering: Designing pressure vessels, pipes, and structures
- Medicine: Blood pressure measurement and monitoring
- Automotive: Tire pressure and hydraulic systems
- Meteorology: Weather forecasting and atmospheric pressure
- Aviation: Cabin pressure and altimetry
- Hydraulics: Hydraulic presses and braking systems
Units of Pressure
Common units used to measure pressure:
- Pascal (Pa): SI unit, 1 Pa = 1 N/m²
- Kilopascal (kPa): 1,000 Pa
- Megapascal (MPa): 1,000,000 Pa
- Bar: 100,000 Pa (approximately 1 atm)
- Atmosphere (atm): Standard atmospheric pressure
- Pounds per square inch (psi): Imperial unit
- Millimeters of mercury (mmHg): Used in medicine
- Torr: Equal to 1 mmHg
Key Takeaways
P = F/A
Pressure is force per unit area - fundamental relationship
Unit Conversions
1 atm = 101,325 Pa = 14.7 psi = 1.013 bar
Fluid Pressure
P = ρgh - pressure increases with depth in fluids
Pressure Types
Absolute, gauge, atmospheric, hydrostatic, and dynamic pressure
Understanding Pressure in Physics
Pressure is a fundamental physical quantity that describes the force applied perpendicular to the surface of an object per unit area. It's a crucial concept in physics, engineering, medicine, and many other fields. Understanding pressure helps us understand everything from weather patterns to hydraulic systems.
Pressure Formulas
Key formulas for pressure calculations:
- Basic Formula: P = F/A (Pressure = Force / Area)
- Find Force: F = P × A
- Find Area: A = F/P
- Fluid Pressure: P = ρgh (density × gravity × height)
Unit Conversions
Common pressure unit conversions:
- 1 atm = 101,325 Pa = 14.7 psi = 1.013 bar = 760 mmHg
- 1 bar = 100,000 Pa = 14.5 psi
- 1 psi = 6,895 Pa = 0.068 atm
- 1 kPa = 1,000 Pa
- 1 MPa = 1,000,000 Pa
Types of Pressure
Different types of pressure measurements:
- Absolute Pressure: Total pressure including atmospheric pressure
- Gauge Pressure: Pressure above atmospheric pressure
- Atmospheric Pressure: 101,325 Pa at sea level
- Hydrostatic Pressure: Pressure in fluids due to gravity
- Dynamic Pressure: Pressure due to fluid motion
Using This Calculator
Follow these steps:
- Step 1: Select calculation mode (Find Pressure, Force, or Area)
- Step 2: Enter the known values with appropriate units
- Step 3: Click "Calculate" to find the unknown value
- Step 4: View results in multiple pressure units
- Step 5: Check the pressure level indicator
- Step 6: Check the Reference tab for common pressure values
- Step 7: Read the Guide tab to learn about pressure concepts
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