Physical Constant

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Physical constant, sometimes called fundamental physical constant or universal constant, is a physical quantity that is generally believed to be both universal in nature and have constant value in time. It is contrasted with a mathematical constant, which has a fixed numerical value, but does not directly involve any physical measurement.

There are many physical constants in science, some of the most widely recognized being the speed of light in vacuum c, the gravitational constant G, Planck’s constant h, the electric constant ε0, and the elementary charge e. Physical constants can take many dimensional forms: the speed-of-light signifies a maximum speed for any object and is expressed dimensionally as length divided by time; while the fine-structure constant α, which characterizes the strength of the electromagnetic interaction, is dimensionless. — Wikipedia

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Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

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    In the near future, astronomers will benefit from the presence of next-generation telescopes like the James Webb Space Telescope (JWST) and the Nancy Grace Roman Space Telescope (RST). At the same time, improved data mining and machine learning techniques will also allow astronomers to get more out of existing instruments. In the process, they hope to finally answer some of the most burning questions about the cosmos.

  • Physicists make square droplets and liquid...
    on September 15, 2021 at 6:00 pm

    When two substances are brought together, they will eventually settle into a steady state called thermodynamic equilibrium; examples include oil floating on top of water and milk mixing uniformly into coffee. Researchers at Aalto University in Finland wanted to disrupt this sort of state to see what happens—and whether they can control the outcome.

  • NYC food delivery workers face a 'harrowing world'
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    New York City's app-based delivery workers—a lifeline to city residents during the COVID-19 pandemic—regularly face nonpayment or underpayment, unsanitary or unsafe working conditions and the risk of violence, according to a new report released Sept. 13 by Los Deliveristas / Worker's Justice Project and the Cornell University ILR School's Worker Institute.

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    As firefighters tried to protect homes near Lake Tahoe from one of California's largest fires on record, they battled, windblown embers that kept sparking new small fires, some well away from the fire line.

  • The trauma of war was passed on in Finnish...
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    The time of war left its mark on Finnish families. Many fathers and young men returning from the front were traumatized, had nightmares, drunk heavily and were violent against their family members. Often, their ability to work and provide was not the same as before. Many mothers who took sole care of the home and farm work, on the other hand, were exhausted.