Basics
The SI-system, unit converters, physical constants, drawing scales and more
Acceleration of Gravity and Newton's Second Law
Acceleration of gravity and Newton's Second Law - SI and Imperial units
Acceleration Units Converter
Convert between units of acceleration
Air - Thermophysical Properties
Thermal properties of air - density, viscosity, critical temperature and pressure, triple point, enthalpi and entropi, thermal conductivity and diffusicity, and more
Angle Converter
Convert between angle units
Area Units Converter
Convert between area units
Becquerel to Curie Radiation Units
Convert from Bequerel to Curie radiation units
British Imperial System
A principal system of units
Buffer solutions
Definitions, explanations and examples of how to make buffer solutions
Circles - Circumferences and Areas
Area and circumferences of circles with diameters in inches
Concentration Units 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
Conversion Chart - from Inches to mm and vice versa
Convert fractional and/or decimal inches to metric mm - and vice versa
Convert Gallons of Water to Pounds
and vice versa
Decimal System Prefixes
Prefix names of multiples and submultiples of units
Density, Specific Weight and Specific Gravity
An introduction to density, specific gravity and specific weight - formulas with examples
Dimensionless numbers
Definitions and symbols for physical and chemical dimensionless quantities, with areas of application of the different numbers. Reynolds, Euler, Nusselt, Prandtl and many more
Drawing Scales
Commonly used scales for blueprint drawings
Efficiency
Usefulnes of a process
Electromagnetic Spectrum
Electromagnetic wavelengths and frequencies
Elements of the Periodic System
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
Empirical Equations
Empirical equations or formulas
Equilibrium
Mechanical, thermal, electrostatic, phase and chemical equilibrium
Exponents - Powers and Roots
Fractional and integer exponents laws
Flow Units Converter
Convert between volume flow units - gpm, liter/sec, cfm, m3/h - an online flow unit calculator
Gallons, Cubic Feet and Cubic Meters Converting Chart
Convert between U.S. liquid Gallons, U.K. liquid Gallons, Cubic Feet and Cubic Metre
Geological Time Scale
Geological periods
Heat Capacity
The heat capacity of a substance is the amount of heat required to change its temperature by one degree, and has units of energy per degree
Humid Air and the Ideal Gas Law
Pressure, temperature and volume for an ideal or perfect gas like air with water vapor - or moist air
Ideal Gas Law
The relations between volume, pressure, temperature and quantity of a gas, including definition of density of a gas
Inches - Fractional to Decimal Equivalents
Decimal equivalents of eights, sixteenths, thirty-seconds and sixty-fourths of an inch
Inches - Fractions and Decimal Equivalents
Inches - fractional and decimal equivalents
Inches to feet, yards and meters - Conversion Chart
Convert from inches to feet, yards and metre
Length Units Converter
Convert between common length units like meters, feet, inches, nautical miles and more
Logarithms
Rules of logarithms - log10 and loge for numbers ranging 1 to 1000
Mass Moment of Inertia
Mass Moment of Inertia (Moment of Inertia) depends on the mass of the object, its shape and its relative point of rotation - Radius of Gyration
Mass vs. Weight
Mass vs. weight - the Gravity Force
Mixtures, Solutions and Suspensions
What is mixtures, solutions and suspensions?
Mole and Avagadro's Number
The mole is the SI base unit for amount of substance
Naming of inorganic binary compounds
Rules for naming inorganic ionic and covalent types of chemical compounds
Naming of organic compounds
Nomenclature rules for different groups of organic compounds and functional groups, together with examples of use of the rules
Non-ideal gas - Van der Waals equation and constants
Listing of 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
Online Fuel Equivalents Calculator
Online calculator to compute fuels energy equivalents - oil and gas
Optical Distance Law
Distance and geometric dilution of light
Ounces and Pounds converted to Grams
Converting ounces (ozs.) and pounds (lbs.) to grams (g)
Parts per million - ppm
ppm - parts per million - commonly used as a unit of concentration
Periodic Table of Elements
The periodic table of the elements with atomic numbers
pH Definition - Basic (alkaline) vs Acidic
Introduction to pH - acidic and basic (alkaline)
Physical Constants
Physical constants - SI Units
Pressure
Introduction to pressure - psi and Pa - online pressure units converter
Pressure to Head - Unit Converter
Convert between pressure and head units - like lb/in2, atm, inches mercury, bars, Pa and more ..
Pressure Units - Online Converter
Convert between pressure units like Pa, bar, atmosphere, pound square feet, psi and more
Property vs. State
Concept of properties and state
Pumps, Fans and Turbines - Horsepower
British Horse Power in pumps, fans and turbines - and how to convert to other units
Radian
The radian - unit of angle - and angular velocity
Ratios and Proportions
Relative values between quantities - ratios and proportions
Real Numbers Algebra
Real numbers algebra - commutative law for addition, associative law for addition and more
SI System
An introduction to the SI-system
Solar System Constants
Sun, Earth and Moon constants
Solids - Volumes and Surfaces
Volume and surface of solids like rectangular prism, cylinder, pyramid, cone and sphere - online calculator
Solubility
A measure of the maximum amount of a solute that can be dissolved in a solvent
Solutions, molarity and dilution
Definitions and examples of how to calculate wt%, molarity and prepare dilutions
Some Measuring Units
Some commonly used measuring units - gross, dozen, quire, sheets ..
Specific Heat - Online Unit Converter
Online specific heat converter with the most commonly used units
Standard state and enthalpy of formation, Gibbs free energy of formation, entropy and heat capacity
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
STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure
The definition of STP - Standard Temperature and Pressure and NTP - Normal Temperature and Pressure
Symbols Used to Denote a Chemical Reactions and Process or Condition
Explanation of symbols used as subscripts or superscripts to tell more about the type of chemical reaction, process or condition
Temperature
Introduction to temperature - including Celsius, Fahrenheit, Kelvin and Rankine definitions - an online temperature converter
Thermodynamics Key Values Internationally Agreed
Internationally agreed, internally consistent, values for the thermodynamic properties (standard enthalpy of formation, entropy and [H°(298)-H°(0)]) of key chemical substances
Total and partial pressure - Dalton's law of partial pressures
How to calculate total pressure and partial pressures for gas mixtures from Ideal Gas Law
Trigonometric Functions
Sine, Cosine and Tangent - Natural Trigonometric Functions
Unit Converter with commonly used Units
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
USCS - United States Customary System Units
United States Customary System Units or Imperial Units
Vector Addition
Online vector calculator - add vectors with different magnitude and direction - like forces, velocities and more
Velocity Units Converter
Convert between common velocity and speed units - online converter
Volume Units Converter
Convert between common volume units like cubic metre, cubic feet, cubic inches and more
Water Content in Food and other Products
Water content before and after drying in food and other products cork, grain, soap, peat, wood and more
Water Pressure and Head
Pressure in pounds per square inch (psi) versus head in feet of water (fth2o)
