A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. The main distinction is that the focus of a compressor is to change the density or volume of the fluid, which is mostly only achievable on gases. Gases are compressible, while liquids are relatively incompressible, so compressors are rarely used for liquids. The main action of a pump is to pressurize and transport liquids.
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Pressurised bubbles trapped deep inside the ice of tidewater glaciers play an important role in how meltwater is released by these giant structures.
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Microplastic fibres travel much further in the air than spherical beads. Study also shows oceans are a major source of particles in the atmosphere.
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Many complex systems relax slowly towards equilibrium after a perturbation, without ever reaching it. Experiments with crumpled sheets now show that relaxation involves avalanches of localized instabilities, whose slow-down leads to logarithmic aging.
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More than 500 free-floating "rogue planets" – including 40 extra-bizarre planets in binary pairs – have been discovered wandering through the Orion Nebula thanks to new observations by the JWST.
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NASA launches Psyche mission to understand how planets and other bodies separated into layers – including cores, mantles and crusts.
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Sonobiopsy uses ultrasound and microbubbles to perform brain biopsies without the dangers of brain surgery.
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An axial compressor is a gas compressor that can continuously pressurize gases. It is a rotating, airfoil-based compressor in which the gas or working fluid principally flows parallel to the axis of rotation, or axially. This differs from other rotating compressors such as centrifugal compressor, axi-centrifugal compressors and mixed-flow compressors where the fluid flow will include a "radial component" through the compressor. The energy level of the fluid increases as it flows through the compressor due to the action of the rotor blades which exert a torque on the fluid. The stationary blades slow the fluid, converting the circumferential component of flow into pressure. Compressors are typically driven by an electric motor or a steam or a gas turbine. Axial flow compressors produce a continuous flow of compressed gas, and have the benefits of high efficiency and large mass flow rate, particularly in relation to their size and cross-section. They do, however, require several rows of airfoils to achieve a large pressure rise, making them complex and expensive relative to other designs (e.g. centrifugal compressors).
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Physicists working on the ATLAS experiment have determined the strength of the strong force to the highest level of precision to date.
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A new analysis by an international team of physicists suggests that dark photons – hypothetical particles that carry forces associated with dark matter – could explain data from high-energy scattering experiments.
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