Effects of work, heat and energy on systems

1st Law of Thermodynamics

The First Law of Thermodynamics simply states that energy can be neither created nor destroyed (conservation of energy). Thus power generation processes and energy sources actually involve conversion of energy from one form to another, rather than creation of energy from nothing

2nd Law of Thermodynamics

The second law is concerned with entropy, which is a measure of disorder. The second law says that the entropy of the universe increases

Absorbed Solar Radiation

Solar radiation absorbed by various materials

Alternative Fuels - Properties

Properties of alternative fuels like Biodiesel, E85, CNG and more

Aluminum - Radiation Heat Emissivity

Radiation heat emissivity of unoxidized, oxidized and polished aluminum

Arithmetic and Logarithmic Mean Temperature Differences in Heat Exchangers

Arithmetic Mean Temperature Difference - AMTD - and Logarithmic Mean Temperature Difference - LMTD - formulas with examples - Online Mean Temperature Calculator

Bimetallic Strips

Heat and bending of bimetallic strips

Carnot Efficiency

The efficiency of the Carnot cycle

Coefficients of Linear Thermal Expansion

Linear temperature expansion coefficients for aluminum, copper, glass, iron and other common materials

Conductive Heat Transfer

Heat transfer takes place as conduction in a soilid if there is a temperature gradient

Convective Heat Transfer

Heat transfer between a solid and a moving fluid is called convection. This is a short tutorial about convective heat transfer

Cooling Mode - Heat Flux

Heat fluxes for various cooling or heat transfer modes

Critical Points of some Substances

Critical points of some common substances like air, argon, helium and more

Critical Temperatures and Pressures for some Common Substances

Critical temperatures and pressures for some common substances - air, alcohol, ether, oxygen and more

Density of Liquids versus change in Pressure and Temperature

Density and specific volume of a liquid versus change in pressure and temperature

Diffusion Coefficients

A substance will flow from a region of high concentration to a region of low concentration

Dowtherm A

Physical properties of Dowtherm A


Efficiency is the ratio between the useful energy output and the energy input

Emissivity Coefficients for some common Materials

Radiation emissivities of some common materials like water, ice, snow, grass and more

Emissivity Coefficients of some common Materials

The radiation heat transfer emissivity coefficient of some common materials as aluminum, brass, glass and many more


Energy is the capacity to do work

Energy Conversion Factors

Convert between energy units

Energy Storage Density

Energy density - by weight and volume - for some ways to store energy

Energy Storage in Heated Water - kWh

Thermal energy stored in heated water

Energy Transfer Equation

Fluid energy transfer

Fouling and Reduced Heat Transfer in Heat Exchangers

The heat-transfer in a heat exchanger is reduced by fouling

Freezing and Melting Points for common Liquids

Common fluids and their freezing and melting points

Freezing Mixtures and Cooling Agents

Freezing mixtures, cooling agents and freezing points

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

Heat Exchanger Heat Transfer Coefficients

Overall heat transfer coefficients in heat exchanger constructions - tubular, plate or spiral

Heat of combustion

Tabulated values of heat of combustion (= energy content) of common substances, together with examples showing how to calculate the heat of combustion

Heat Storage in Materials

Energy stored as sensible heat in materials

Heat Value

The gross (high) and net (low) heating values

Heat, Work and Energy

Heat, work and energy tutorial - essentials as specific heat

Heating Up Applications - Energy Required and Heat Transfer Rates

Energy required when heating up substances

Heavy Water - Thermodynamic Properties

Thermodynamic properties of heavy water (D2O) - density, melting temperature, boiling temperature, latent heat of fusion, latent heat of evaporation, critical temperature and more

Ideal Gas Properties of Nitrogen

Enthalpy, internal energy and entropy of Nitrogen

Latent Heat of Melting for some common Materials

Latent heat of fusion when changing between solid or liquid state for common materials like aluminum, ammonia, glycerin, water and more

Linear Thermal Expansion

Linear temperature expansion - online calculator

Microwave Heating

Heating with microwaves

Mixing Liquids and/or Solids - Final Temperatures

Calculate the final temperature when liquids or solids are mixed

Mollier Chart for Water - Imperial Units

Mollier chart for water in English Units

Mollier Chart for Water - Metric Units

Mollier chart for water in Metric Units

Mollier Diagram for Water-Steam

Enthalpy-entropy diagram for water and steam

Overall Heat Transfer Coefficient

Calculate overall heat transfer coefficients for walls or heat exchangers

Overall Heat Transfer Coefficients for Fluids and Heat Exchanger Surface Combinations

Average overall heat transmission coefficients for some common fluids and surface combinations as Water to Air, Water to Water, Air to Air, Steam to Water and more

Power Plant Performance Efficiency

Power plant heat rate, thermal efficiency, capacity factor, load factor, economic efficiency, operational efficiency, energy efficiency

Properties and State

Concept of properties and state

Radiation Constants Building Materials

The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for a material

Radiation Heat Transfer

Heat transfer due to emission of electromagnetic waves is known as thermal radiation

Rankine Efficiency

The efficiency of the Rankine cycle

Salt Hydrates - Melting points and Latent Energy

Melting points and latent energy of salt hydrates

Solids - Volume Temperature Expansion Coefficients

Cubical expansion coefficients for solids

Specific Heat - Online Unit Converter

Online specific heat converter with the most commonly used units

Specific Heat and Individual Gas Constant of Gases

Specific heat at constant volume, specific heat at constant pressure, specific heat ratio and individual gas constant - R - common gases as argon, air, ether, nitrogen and many more ..

Specific Heat of common Substances

Specific heat of materials like wet mud, granite, sandy clay, quartz sand and more

Specific Heat of Food and Foodstuff

Specific heat of common food and foodstuff like apples, bass, beef, pork and many more

Specific Heat of Liquids and Fluids

Common liquids and fluids - acetone, oil, paraffin, water and many more - and their specific heats

Specific Heat of Solids

Common solids - like brick, cement, glass and many more - and their specific heats - in Imperial and SI units

Specific Heats for Metals

Commonly used metals - aluminum, iron, mercury and many more - and their specific heats - imperial and SI units

Standard enthalpy of formation, Gibbs energy of formation, entropy and molar heat capacity of organic substances

The standard enthalpy of formation, Gibbs energy of formation, entropy and molar heat capacity are tabulated for more than hundred organic substances.

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

Standardized Enthalpies and Entropies

Standardized enthalpies and entropies for some common substances

Surface - Radiation Absorptivity

Radiation surface absorptivity

Symbols Used to Denote a Chemical Reaction, Process or Condition

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


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

Temperature Expansion Coefficients of Piping Materials

Expansion coefficients for common materials used in pipes and tubes - aluminum, carbon steel, cast iron, PVC, HDPE and more

Thermal Conductivities for some common Liquids

Some fluids and their thermal conductivities

Thermal Conductivities of Heat Exchanger Materials

Typical heat exchanger materials and their thermal conductivities

Thermal Conductivity Conversion Factors

Convert between thermal conductivity units

Thermal Conductivity of common Materials and Gases

Thermal conductivity of gases, insulation products, aluminum, asphalt, brass, copper, steel and other common materials

Thermal Conductivity Online Converter

Convert thermal conductivities

Thermal Expansion - Superficial i.e. Area

Superficial i.e area temperature expansion - online calculator

Thermal Resistivity and Conductivity

Thermal resistivity and conductivity

Thermal Transmittance and Thermal Resistance

Thermal transmittance U and thermal resistance R

Thermodynamic Terms, Functions and Relations

Common thermodynamic terms and functions - potential energy, kinetic energy, thermal or internal energy, chemical energy, nuclear energy and more

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

Third Law of Thermodynamics

The entropy of a substance is zero if the absolute temperature is zero

Units of Heat - BTU, Calorie and Joule

The most common units of heat are BTU - British Thermal Unit, Calorie and Joule

Volumetric - or Cubic Thermal Expansion

Volumetric temperature expansion with online calculator

Volumetric or Cubical Expansion Coefficients of Liquids

Volumetric expansion coefficients of some common liquids

WABT - weighted average bed temperature

Definition and examples of calculation of weighted average bed temperature in adiabatic reactors

Water - Boiling Temperature at Vacuum Pressure

Figures and tables giving the boiling temperatures of water in varying vacuum pressure, SI and Imperial units.

Water - Enthalpy (H) and Entropy (S)

Figures and tables showing the enthalpy and entropy of liquid water as function of temperature - SI and Imperial Units

Water - Heat Capacaty (Specific Heat)

Specific heat of liquid water at constant volume or constant pressure at temperatures from 0 to 360 °C (32-700 °F) - SI and Imperial units

Water - Heat of Vaporization

Heat of vaporization of water, at temperatures from 0 - 370 °C (32 - 700 °F) - SI and Imperial units, given in figures and tables.

Water - Ionization Constant, pKw, of normal and heavy water

Ionization constant (= dissociation constant = self-ionization constant = ion product = autoprotolysis constant ) of water and heavy water, given as function of temperature (°C and °F) in figures and tables

Water - Pressure and Boiling Points

Boiling points of water at pressures ranging from 0.5 to 1000 psia

Water - Specific Gravity

Figures and tables showing specific gravity of liquid water in the range of 32 to 700 °F or 0 to 370°C, using water density at four different temperatures as reference

Water Steam - the Critical Point and the Triple Point

Critical point is where vapor and liquid are indistinguishable and triple point is where ice, water and vapor coexist in thermodynamic equilibrium


Work done is the product of applied force and distance

Zeroth Law of Temperature

Temperature and heat flow

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