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Chemical
The frequency of the relaxation based on the Arrhenius equation
Calculator based on the given temperature, the frequency of vibration and thermal activation energy calculated częsość relaxation.
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Calculator enthalpy
Enthalpy calculator is used to calculate the heat transfer during the process kwazistatycznego occurring in a closed thermodynamic system under constant pressure (isobaric process).
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Chemical
Dilution of solutions
Legend of given volume and calculates the concentrations of the solutions before and after dilution of the volume of solution added is calculated.
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Chemical
Molar concentration of mass and volume
Calculator allows to determine the molar concentration of the solution.
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Life
Alcohol Calculator - witrualny breathalyzer online converter
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Calculator allows you to calculate the approximate concentration of liquor in the blood by Erik Widmark formula.
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Verifiers
Verification ISBN preview
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Jak zweryfikować numer ISBN?
Calculator allows you to verify the ISBN number entered.
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Verifiers
Verification of the social security number in Poland
It presents data deriving from the unique social security number, such as date of birth, sex, serial number and check its correctness.
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Verifier numbers EAN-13 preview
Verifier numbers EAN-13
Calculator allows you to verify the number entered EAN-13.
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Math
Circumference of an ellipse
The calculator calculates the circumference of an ellipse for a given length of the axis passing through it.