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
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Ancient Mars had right conditions for underground...
on September 24, 2018 at 2:32 pm
A new study shows evidence that ancient Mars probably had an ample supply of chemical energy for microbes to thrive underground. […]
Three things we can all learn from people who...
on September 19, 2018 at 2:40 pm
Many of us spend hours every day tethered to our devices, pawing at the screen to see if it will deliver a few more likes or emails, monitoring the world and honing our online presence. Social networking platforms such as Whatsapp, Snapchat, Instagram, Facebook and Twitter are supposed to make us feel more connected. Yet our reliance on technology to "see" the social world around us can be a heavy burden. […]
After 150 years, a breakthrough in understanding...
on September 17, 2018 at 7:00 pm
Using surface-enhanced Raman spectroscopy, Columbia Engineers are first to observe how CO2 is activated at the electrode-electrolyte interface; their finding shifts the catalyst design from trial-and-error paradigm to a rational approach and could lead to alternative, cheaper, and safer renewable energy storag […]
A complex interplay between transport and...
on September 17, 2018 at 1:40 pm
Physicist Richard Feynman highlighted the importance of fluctuations in living matter when he stated, "Everything that living things do can be understood in terms of the jigglings and wigglings of atoms." This holds true for the widely investigated transport driven by fluctuations in biological nanopores and for similar observations in non-living fluid phases, where bulk hydrodynamic fluctuations dramatically affect nanoscale dynamics. Numerical simulations have also highlighted the impact of […]
World speed record for polymer simulations...
on September 17, 2018 at 11:49 am
From a humble plastic bag to ultra-light airplane wings, polymers are everywhere. These molecules are long chains of atoms that play many roles for good and bad, from organic photovoltaics to indestructible plastic pollution. Polymers are useful in liquid form, as well: The difference between tomato puree and ketchup is merely 0.5 percent of xanthan gum, which is a polymer made from sugar. Ketchup is thick but not sticky, thanks to xanthan chains that are so long that they interpenetrate and […]