Basics

Acceleration of gravity and Newton's Second Law - SI and Imperial units.

Converting between units of acceleration.

Thermal properties of air, including density, viscosity, thermal conductivity, specific heat and more at different temperatures and pressures. Comprehensive reference with formulas, tables, and charts to support engineering calculations.

Converting between angle units.

Convert between units of area.

Bands and their ranges of frequencies and wavelengths.

A principal system of units.

Definitions, explanations and examples of how to make buffer solutions.

Computer bytes.

Circumferences and areas of circles with diameters in inches.

Introduction to temperature - including Celsius, Fahrenheit, Kelvin and Rankine definitions - and an online temperature converter.

Calculator and formulas for conversion between different units of concentration: Molarity, molality, mole fraction, weight percent of solute and grams of solute per liter of solution - descriptive terms for solubility.

Prefix names used for multiples and submultiples units.

The difference between density, specific weight, and specific gravity. Including formulas, definitions, and reference values for common substances.

Designation of large number in US vs. other countries.

Physical and chemical dimensionless quantities - Reynolds number, Euler, Nusselt, and Prandtl number - and many more.

Commonly used blueprint drawing scales.

The measure of usefulness.

The electromagnetic spectrum with wavelengths and frequencies.

The elements of the periodic system with names, symbols, atomic numbers and weights, melting and boiling points, density, electronegativity and electron affinity, and electron configuration.

Equations based on observations and experience.

The mechanical, thermal, electrostatic, phase or chemical states of equilibrium.

The laws of fractional and integer exponents.

The inches fractional and decimal equivalents.

Online fuels energy equivalents calculator for oil, gas and more.

- and vice versa.

Geological periods and time scale.

The amount of heat required to change the temperature of a substance by one degree.

Pressure, temperature and volume in a perfect ideal gas like moist air (air with water vapor).

Convert fractional and/or decimal inches to metric mm - and vice versa.

Convert between inches, feet, yards and meters.

The decimal equivalents of eights, sixteenths, thirty-seconds and sixty-fourths of an inch.

Convert between length units like meters, feet, inches, nautical miles and more.

The rules of logarithms - log₁₀ and log_e for numbers ranging 1 to 1000.

The Mass Moment of Inertia vs. mass of object, it's shape and relative point of rotation - the Radius of Gyration.

Mass vs. weight - the Gravity Force.

Mixtures vs. solutions vs. suspensions.

The mole is the SI base unit for an amount of a substance.

Rules for naming inorganic ionic and covalent types of chemical compounds.

Nomenclature rules for different groups of organic compounds and functional groups, together with examples of use of the rules.

The van der Waals constants for more than 200 gases used to correct for non-ideal behavior of gases caused by intermolecular forces and the volume occupied by the gas particles.

Geometric dilution of light vs. distance.

Converting ounces (ozs.) and pounds (lbs.) to grams (g).

ppm - or parts per million - is commonly used as a unit of concentration.

The periodic table of the elements with their atomic numbers.

Introduction to pH - the acidic and basic (alkaline) definition.

Physical constants - SI Units.

IEC International Standard names and symbols

Introduction to pressure - online pressure units converter.

Pressure vs. head units - like lb/in², atm, inches mercury, bars, Pa and more.

Convert between pressure units like Pa,  bar, atmosphere, pound square feet, psi and more.

The concept of properties and state.

British Horse Power as used for pumps, fans and turbines - and how to convert to other units.

Radian is the SI unit of angle. Convert between degrees and radians. Calculate angular velocity.

Convert between Bequerel and Curie radiation units.

The relative values between quantities - ratios and proportions.

The commutative and associative law for addition and more.

An introduction to the SI metric system.

Properties and data for the Sun, the Earth and the Moon.

The volume and surface of solids like rectangular prism, cylinders, pyramids, cones and spheres - online calculator.

The amount of a solute that can be dissolved in a solvent.

Definitions and examples of how to calculate wt%, molarity and how to prepare dilutions.

Commonly used measuring units - like gross, dozen, quire, sheets and more.

Online specific heat converter with the most commonly used units.

Definition and explanation of the terms standard state and standard enthalpy of formation, with listing of values for standard enthalpy and Gibbs free energy of formation, as well as standard entropy and molar heat capacity, of 370 inorganic compounds.

The definition of STP - Standard Temperature and Pressure and NTP - Normal Temperature and Pressure.

Explanation of symbols used as subscripts or superscripts to tell more about the type of chemical reaction, process or condition.

The relationship between volume, pressure, temperature and quantity of a gas, including definition of gas density.

Internationally agreed, internally consistent, values for the thermodynamic properties (standard enthalpy of formation, entropy and [H°(298)-H°(0)]) of key chemical substances.

How to calculate total pressure and partial pressures for gas mixtures from Ideal Gas Law.

Sine, cosine and tangent - the natural trigonometric functions.

Common converting units for Acceleration, Area, Density, Energy, Energy per unit mass, Force, Heat flow rate, Heat flux, Heat generation per unit volume and many more.

Convert between units with the unit factor or factor-label method

An overview of the United States Customary System Units - Imperial Units.

Online vector calculator - add vectors with different magnitude and direction - like forces, velocities and more.

Convert between common velocity and speed units.

Convert between volume units like U.S. liquid gallons, U.K. liquid gallons, cubic feet, cubic metre and more.

Convert between volume flow units like gpm, liter/sec, cfm, m³/h.

Convert between common volume units like cubic metre, cubic feet, cubic inches and more.

Water content before and after drying - in food and other products cork, grain, soap, peat, wood and more.

Pressure in pounds per square inch (psi) vs. head in feet of water (ft h2o).