Mechanics

Laboratory and engineering work generates a long tail of specialist units that rarely appear anywhere else: moles and millimoles, molarity, density in grams per cubic centimetre or pounds per cubic foot, dynamic and kinematic viscosity, torque, flow rate and concentration. Papers, datasheets and supplier catalogues each pick their own favourites.

That variety creates friction whenever you combine sources. A protocol written in one country specifies concentration in molarity while your stock solution is labelled in percent weight per volume; a pump datasheet quotes flow in litres per minute while the process specification is in cubic metres per hour. Converting by hand invites the decimal place error that quietly ruins an experiment.

This converter groups the mechanical and chemical quantities you actually meet in practice, so students, technicians and engineers can move a value into the unit their calculation needs and get on with the work. Always sanity check the magnitude of the answer as well as the arithmetic.

How to use the Mechanics

1. Select the quantity you need, such as density, viscosity, concentration or flow.
2. Choose the unit used by your source document.
3. Choose the unit required by your calculation or protocol.
4. Enter the value and read the converted result.
5. Check that the order of magnitude looks plausible before using the number.

Examples

• A chemistry student converts a concentration given in grams per litre into molarity using the compound's molar mass.
• A process engineer converts a pump rating in litres per minute into cubic metres per hour to match a plant specification.
• A materials technician converts a density quoted in pounds per cubic foot into kilograms per cubic metre for a report.

Frequently asked questions

Can it convert grams to moles directly?

Only if you supply the molar mass of the substance, since the relationship depends entirely on the compound involved.

What is the difference between dynamic and kinematic viscosity?

Dynamic viscosity, in pascal-seconds, measures resistance to flow. Kinematic viscosity, in square metres per second, is dynamic viscosity divided by density.

Is molarity the same as molality?

No. Molarity is moles per litre of solution and varies with temperature; molality is moles per kilogram of solvent and does not.

Are the results precise enough for lab work?

The arithmetic is exact to the precision shown, but your result is only as good as the input measurement and the significant figures you carry through.

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