# Category: Physics

## SI-Derived Units

Quantity Unit Symbol Area Length squared m2 Volume Length cubed m3 Density Mass per cubic volume kg/m3 Speed Distance traveled per unit time m/s Acceleration Speed changed per unit time m/s2 […]

## SI Units

Quantity Unit Symbol Length meter m Mass kilogram kg Time second s Temperature kelvin K Amount of Substance mole mol Electric current ampere A Luminous intensity candela cd

## Weight Conversions

To Convert From To Multiply by Gram Kilogram 0.001 Milligram 1000 Ounce (avoirdupois) 0.035273962 Ton (metric) 1 x 10-6 Kilogram Gram 1000 Ounce (avoirdupois) 35.273962 Ton (metric) 0.0001 Ton (short) 1.1023113 […]

## Distance and Area Conversions

To Convert From To Multiply by Acre Hectare 0.40468564 Square foot 43560 Square kilometer 4.046856 x 10-3 Square meter 4046.85642 Square mile 1.5625 x 10-3 Square yard 4840 Astronomical Unit Kilometer […]

## Pressure Conversions

To Convert From To Multiply by Atmosphere Bar 1.01325 Kilopascal 101.325 Millibar 1013.25 millimeter of Hg 760 Pascal 1.01325 x 105 Torr 760 Bar Atmosphere 0.9869233 Kilopascal 100 Millibar 1000 millimeter […]

## Volume Conversions

To Convert From To Multiply by cubic centimeter cubic foot 3.531467 x 10-5 cubic inch 0.06102374 cubic meter 1 x 10-6 cubic millimeter 1000 cubic yard 1.307951 x 10-6 Gallon (U.S.-liquid) […]

## Energy Conversions

To Convert To Multiply by BTU Calorie 251.996 Joule 1055.056 Kilocalorie 0.251996 Calorie BTU 3.96832 x 10-3 Joule 4.1868 Kilocalorie 0.001 Dyne-centimeter Erg 1 Joule 1 x 10-7 Erg Dyne-centimeter 1 […]

## Thermal Conductivity Constants

Material Constant (Calorie/cm.C.s) Silica Aerogel 9.554E-8 – 9.554E-7 Air 5.97E-07 Wood 9.554E-7 – 9.554E-6 Hollow Fill Fibre Insulation Polartherm 1.00E-07 Alcohols and Oils 0.000002388 – 0.00000501585 Polypropylene 5.97125E-06 Mineral Oil 3.29613E-06 […]

## Physics Constants

Quantity Value Unit {220} lattice spacing of silicon 1.92016E-10 m alpha particle mass 6.64466E-27 kg alpha particle mass energy equivalent 5.97192E-10 J alpha particle mass energy equivalent in MeV 3727.37917 MeV […]

## Vector Calculus

Question Vectors A and B are shown in the figure. What is |-5.00 A + 4.00 B|? Answer – Using the coordinate systems (x ; y), shown on the figure, simply […]

## Molecular Structure of Nucleic Acids

“We wish to suggest a structure for the salt of deoxyribose nucleic acid (D.N.A.). This structure has novel features which are of considerable biological interest.” J.D. Watson F.H.C. Crick Nature April 25, […]

## Determining the Ideal Gas Constant

In this experiment, a scientist measures the total pressure of gas created when a metal bicarbonate or carbonate is completely decomposed in a fixed volume container at high temperature. The following data […]

## Nebulae

A new study has explained that planetary nebulae may not simply be nebula emissions from a star approaching the end of its life but could be the result of a binary central […]

## ‘Obscured’ Black Holes in Nuclei of Galaxies

Astronomers have carried out an analysis of obscured black holes of distant galaxies. Scientists usually struggle to distinguish between the emissions of obscured black holes and those of their host galaxies. One […]

## Help Scientists Find Supernovae!

The Australian National University is calling all citizen scientists to join in an exciting search for supernovae. A supernova is the final explosion of a dying star. The explosion is said to […]

## Proxima Centauri b and Liquid Water

A new study has revealed that the closest potentially habitable planet to our solar system, Proxima Centauri b, could have liquid water. This supports previous studies which claimed that Proxima Centauri b is […]

## The Dipolar Molecular Car Race

Researchers from the United States, Japan, Germany, France, Switzerland and Austria are racing cars made of single molecules! These nano-cars can be propelled by electric jolts generated by a scanning tunneling microscope. […]

## Wi-Fi Signals Could Let Strangers Inside Your Home

The wireless router in your living room may bring you the convenience of being connected online from anywhere and at any time but it comes at a cost. German scientists have […]

## Researchers Analyze Biases That Affect Scientific Studies

Biases in scientific studies are thought to be among the main factors that affect the reproducibility of results. A new study has assessed some of these biases and how they affect the […]

## Scientists Could Be on the Verge of Finding new Particles

Researchers have reported some oddities during an experiment with the Large Hadron Collider (LHCb), which does not tally with the Standard Model of particles physics and could indicate the existence of new […]