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Ideal-gas properties of water vapor, H2O 983 Enthalpy of formation, Gibbs function of formation, and absolute entropy at 778C, 1 atm 985 Properties of some common fuels and hydrocarbons 986. Figure A–31E Psychrometric chart at 1 atm total pressure 987. 947 947. Molar mass, gas constant, and critical-point properties.
Energy and Power Units and Conversions Basic Energy Units 1 Joule (J) = Newton ‡ meter 1 calorie (cal)= 4.18 J = energy required to raise the temperature of 1 gram of water by 1”C 1 Btu = 1055 Joules = 778 ft-lb = 252 calories = energy required to raise the temperature 1 lb of water by 1”F 1 ft-lb = 1.356 Joules = 0.33 calories
This appendix presents the SI and English (imperial) units, which are used in various areas of trans-portation engineering, and their conversion factors. Some metric units and factors that are not listed in the SI but are commonly used and remain internationally recognized are also included.
British Thermal Unit (Btu) Measurements and Conversions. Approximate definition: A British thermal unit is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. Btu = 252 International Table calories. calorie = .00397 Btu. Btu = .252 kilocalories.
The tables below list conversion factors for units of energy and power used in the KEEP Energy Education Activity Guide.
Physicists like to the use energy unit called the joule (named after James Joule) because it makes their equations look simpler. There are about 4000 joules in a Calorie, 3600 in a Wh, 3.6 million in a kWh. The energy table below shows the approximate energies in various substances.
Chapter 1. Basic concepts. Energy is necessary for all life and all economic activity. Like food and water, energy is indispensable. It has played a fundamental role in the development of civilisations. It has been the cause of war between peoples who have sought throughout history to control access to energy resources.
