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Converting Helium Tank Pressure: From ATM to PSI

Explore the pressure conversion of an 18.0 L helium tank pressurized to 26 ATM. This question prompts you to calculate the equivalent pressure in pounds per square inch (psi). Learn about gas laws, including the Ideal Gas Law, and understand the relationships between atmospheric pressure, mm Hg, torr, Pa, and psi. We'll also touch upon key concepts such as STP (Standard Temperature and Pressure) and the behavior of gases, showcasing fundamental principles in physics and chemistry related to gas behavior and pressure measurements.

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Converting Helium Tank Pressure: From ATM to PSI

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  1. Clicker Question: An 18.0 L helium tank is pressurized to 26 atm. What is the pressure in the tank in units of psi? • 1.8 • 470 • 1.4 • 380 • 21 1 atm = 760 mm Hg = 760 torr = 101325 Pa = 14.7 psi

  2. 10.5 g

  3. Announcements • ALEKS due Tuesday • Quiz due Friday

  4. Chapter 9Gases

  5. Unit Conversions (pressure) 1 atm = 760 mm Hg = 760 torr = 101325 Pa = 14.7 psi

  6. Shrinking of balloon in liquid nitrogen http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/balloon.html Ideal Gas relationships http://www.grc.nasa.gov/WWW/K-12/airplane/Animation/frglab2.html

  7. Ideal Gas Law

  8. Gas Constant* *From Wikipedia

  9. Kinetic Theory of Ideal Gas • Gas molecules are point masses • Gas molecules move randomly • Hit side of container to create pressure • No attraction between molecules • Collisions are elastic • K.E. of gas molecules ∝ temperature

  10. STP(Standard Temperature and Pressure) • 273 K (0°C) • 1 atm

  11. Clicker Question: What is the volume of 1.0 mole of He at STP? • 22.4 L • 24.5 L • 2.27 m3 • 2270 m3 • 44.6 L

  12. Combined Gas Law Modified Combined Gas Law

  13. Laws derived from Ideal Gas Law • Boyles’s Law • Charles Law • Gay-lussac’s Law • Avogadro’s Law

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