These are organized by a classification scheme developed exclusively for Cosma. More…
Fundamental Physical Constants (Institute for Chemistry and Biochemistry)
Physics, Constants, Units, & Uncertainty (NIST)
CODATA Internationally recommended values of the Fundamental Physical Constants (NIST)
CODATA Internationally recommended values of the Fundamental Physical Constants, Universal (NIST)
Physics Fundamentals (Martindale’s Reference Desk)
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
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.
- Work-life balance in a pandemic: A public health...on February 26, 2021 at 2:33 pm
Before the pandemic, a common objection to remote working was the suspicion that staff would disengage and productivity levels would drop. But recent evidence suggests the opposite is true—working from home effectively means working more. In the UK, for example, many employees are reportedly putting in an extra two hours a day. It's even longer in the US.
- Super-resolution RNA imaging in live cellson February 25, 2021 at 3:12 pm
Ribonucleic acid (RNA) is key to various fundamental biological processes. It transfers genetic information, translates it into proteins or supports gene regulation. To achieve a more detailed understanding of the precise functions it performs, researchers based at Heidelberg University and at the Karlsruhe Institute of Technology (KIT) have devised a new fluorescence imaging method which enables live-cell RNA imaging with unprecedented resolution.
- Giving while female: Women are more likely to...on February 25, 2021 at 2:23 pm
The American poet Ambrose Bierce wrote in 1906 that a philanthropist is "a rich (and usually bald) old gentleman who has trained himself to grin while his conscience is picking his pocket."
- Research shows how single celled algae rotate as...on February 24, 2021 at 5:46 pm
Scientists have made a pivotal breakthrough in the quest to understand how single-cell green algae are able to keep track of the light as they swim.
- Experiment reveals new options for synchrotron...on February 24, 2021 at 4:00 pm
Accelerator experts from the Helmholtz-Zentrum Berlin (HZB), the German federal metrology institute Physikalisch-Technische Bundesanstalt (PTB) and Tsinghua University in Beijing have used a laser to manipulate electron bunches at PTB's Metrology Light Source so that they emitted intense light pulses having a laser-like character. Using this method, specialized synchrotron radiation sources would potentially be able to fill a gap in the arsenal of available light sources and offer a prototype […]