Gas Compressibility
Gas Compressibility - Related Videos
08:08
Compression Tests on Hardened Concrete
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA There are two distinct stages in a construction project involving concrete. The first stage involves batching, transporting, and casting fresh concrete. At this stage, the material is viscous, and the workability and finishability are the key performance criteria. The second stage occurs when the hydration process begins shortly after the concrete is placed in the form, and the concrete will...
13:31
A Neonatal Mouse Spinal Cord Compression Injury Model
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Cited by 4 •
2016
This article describes a method for generating a reproducible spinal cord compression injury (SCI) in the neonatal mouse. The model provides an advantageous platform for studying mechanisms of adaptive plasticity that underlie spontaneous functional recovery.
10:27
A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
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Cited by 3 •
2019
This protocol demonstrates how to prepare a briquette sample and conduct a uniaxial compression experiment with a briquette in different CO2 pressures using a visualized and constant-volume gas-solid coupling test system. It also aims to investigate changes in terms of coal’s physical and mechanical properties induced by CO2 adsorption.
07:51
Gas Absorber
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2023
Source: Michael G. Benton and Kerry M. Dooley, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Gas absorbers are used to remove contaminants from gas streams. Multiple designs are used to accomplish this objective1. A packed bed column uses gas and liquid streams running counter to each other in a column packed with loose packing materials, such as ceramics, metals, and plastics, or structured packing1. The packed bed uses surface area created by the packing to...
10:23
Ideal Gas Law
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2023
Source: Laboratory of Dr. Andreas Züttel - Swiss Federal Laboratories for Materials Science and Technology The ideal gas law describes the behavior of most common gases at near-ambient conditions and the tendency of all chemical matter in the dilute limit. It is a fundamental relationship between three measurable macroscopic system variables (pressure, temperature, and volume) and the number of molecules of gas in the system, and is therefore an essential link between the microscopic and the...
FAQs
At constant temperature, pressure and volume vary inversely: increasing pressure reduces volume, while decreasing pressure allows expansion. Boyle’s law provides the idealized relationship used to predict this response, provided temperature remains unchanged. In chemistry, keeping temperature fixed is essential because simultaneous temperature changes would alter the pressure–volume relationship and complicate interpretation.
Real gases depart from ideal predictions because their particles are not perfectly independent. Intermolecular attractions can influence how particles respond as they are crowded, while the particles’ own volume becomes relevant at high compression. These effects explain why pressure–volume behavior may differ from Boyle’s-law expectations and why real-gas analysis requires more than an ideal model.
The compressibility factor expresses how closely a real gas follows the ideal-gas model. Chemists use it alongside pressure, volume, and temperature to quantify nonideal behavior rather than treating the ideal relationship as universally exact. Comparing this factor with ideal behavior helps identify when intermolecular attractions or particle volume must be considered in calculations.
To analyze a gas-compression problem, specify the pressure, volume, and temperature conditions, then determine whether the ideal relationship is appropriate. For constant-temperature changes, Boyle’s law can relate the initial and final states. If real-gas effects matter, include the compressibility factor so the calculation reflects departures caused by attractions and particle volume.
Gas compressibility is especially important when gases are stored or transported under pressure. Compression changes the amount of space required and makes pressure–volume predictions central to these operations. For liquefaction, recognizing departures from ideal behavior is also important because the real-gas response, rather than a purely ideal estimate, informs understanding of the process.
In chemical reactions carried out at high pressure, compressibility affects how gas volume responds to pressure and supports calculations for the reaction environment. The same principles extend to industrial high-pressure synthesis, where pressure, volume, temperature, and nonideal behavior must be considered together. This connects molecular interactions with practical process calculations.