Pressure Formula:
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Definition: This calculator determines the pressure exerted by a gas based on its density and the most probable speed of its molecules.
Purpose: It helps in understanding gas behavior under kinetic theory and calculating pressure in thermodynamic systems.
The calculator uses the formula:
Where:
Explanation: The pressure is calculated from the product of gas density and the square of most probable velocity, divided by 2.
Details: Understanding gas pressure is crucial for designing containers, studying gas laws, and applications in thermodynamics and fluid mechanics.
Tips: Enter the gas density in kg/m³ (default 0.00128 for air at STP) and most probable velocity in m/s (default 20). All values must be > 0.
Q1: What is most probable velocity?
A: It's the velocity at which the maximum fraction of gas molecules are moving at a given temperature.
Q2: How does temperature affect the result?
A: Temperature affects the most probable velocity (Cmp increases with temperature), which in turn affects pressure.
Q3: What are typical density values for common gases?
A: Air at STP ≈ 1.28 kg/m³, Hydrogen ≈ 0.09 kg/m³, Oxygen ≈ 1.43 kg/m³ (all at 0°C, 1 atm).
Q4: How accurate is this calculation?
A: It provides a good estimate for ideal gases under normal conditions. For real gases or extreme conditions, more complex equations may be needed.
Q5: What units does the calculator use?
A: The calculator uses SI units: kg/m³ for density, m/s for velocity, and Pascals (Pa) for pressure.