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Electronegativity Chart
Look up Pauling electronegativity values and predict whether a bond between two elements is nonpolar, polar or ionic.
Science calculators
Physics formulas, chemistry charts and lab helpers. 10 tools in English and 2 in Spanish & Portuguese.
Featured
Live
Kinetic Energy Calculator
Calculate the kinetic energy of a moving object from its mass and speed: KE = ½mv².
Live
Air Density Calculator
Calculate air density from temperature, pressure and humidity, using the ideal gas law for dry air and water vapor.
All science tools
In Spanish & Portuguese
Localized tools for Latin America, Spain, Brazil and Portugal. Many cover local tax and labor rules.
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Ley de Coulomb
Coulomb's law
Calcula la fuerza eléctrica entre dos cargas con la ley de Coulomb, con la constante k y la permitividad del medio.
Live
Ley de Ohm
Ohm's law
Calcula voltaje, corriente, resistencia o potencia con la ley de Ohm: introduce dos valores y obtén los demás.
Frequently asked questions
How many science tools are there?
10 in English, plus 2 in Spanish and Portuguese. 10 are live now; the rest are planned.