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Specific Heat is the amount of heat required to change one mass unit of a substance by one degree in temperature. Value use period as decimal point. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro.
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Modify access date. Scientific Online Calculator.Unit conversions are important in all sciencesalthough they may seem more critical in chemistry because many calculations use different units of measurement. Every measurement you take should be reported with the proper units. While it may take practice to master unit conversionsyou only need to know how to multiply, divide, add, and subtract to do them.
The math is easy as long as you know which units can be converted from one to another, and how to set up conversion factors in an equation. There are several common base quantities, such as mass, temperature, and volume. You can convert between different units of a base quantity, however, you may not be able to convert from one type of quantity to another. For example, you can convert grams to moles or kilograms, but you can't convert grams to Kelvin. Grams, moles, and kilograms are all units that describe the amount of matter, while Kelvin describes temperature.
There are seven fundamental base units in the SI or metric system, plus there are other units that are considered base units in other systems. A base unit is a single unit. Here are some common ones:. Derived units sometimes called special units combine the base units. Also included are volume units. For example, there are liters lmilliliters mlcubic centimeters cm 3. In order to convert between units, you'll want to know common unit prefixes. These are used primarily in the metric system as a sort of shorthand notation to make numbers easier to express.
Here are some useful prefixes to know:. As an example of how to use the prefixes:. For very large or very small numbers, it's easier to use scientific notation :. With all of this in mind, you're ready to perform unit conversions. A unit conversion can be thought of as a sort of equation. In math, you may recall if you multiply any number times 1, it is unchanged.
Unit conversions work the same way, except "1" is expressed in the form of a conversion factor or ratio. Consider the unit conversion:. This could be written as:. If you multiply a value times either of these fractions, its value will be unchanged.
You'll use this to cancel out units to convert them. Here's an example notice how the grams cancel out in the numerator and denominator :. You can enter in these values in scientific notation on your calculator using the EE button:. Here's another example: Convert Either you know the conversion factor between inches and feet or you can look it up:.
Now, you set up the conversion so that the inches will cancel out, leaving you with feet in your final answer:. There are "inches" in both the top numerator and bottom denominator of the expression, so it cancels out. If you had tried to write:. Always check your conversion factor to make sure the correct term cancels out! You may need to switch the fraction around.
Share Flipboard Email.Use this Conversion Calculator to convert between commonly used units. Select the current unit in the left column, the desired unit in the right column, and enter a value in the left column to generate the resulting conversion. A full list of unit conversions is available at unitconverters. Historically, many different systems of units have been used, where a system of units is defined as a collection of units of measurement with rules that relate them to each other.
A unit of measurement is a defined magnitude of a quantity that it used as a standard for measurement for the same kind of quantity, such as measurements of length, weight, and volume.
In the past, many systems of measurement were defined on a local level, and could be based on factors as arbitrary as the length of a king's thumb. While this may work on a local level, when considering trade, as well as science, having systems of units based on units that others may not be able to relate to or understand makes interaction difficult.
As such, the development of more universal and consistent systems developed over time. Today, some of the systems of units in use include the metric system, the imperial system, and the United States customary units. The International System of Units SI is the standard metric system that is currently used, and consists of seven SI base units of length, mass, time, temperature, electric current, luminous intensity, and amount of substance. Although SI is used almost universally in science including in the USsome countries such as the United States still use their own system of units.
This is partly due to the substantial financial and cultural costs involved in changing a measurement system compared to the potential benefit of using a standardized system. As such, many unit converters including this Conversion Calculator exist, and will continue to do so to ensure that people globally are able to communicate different measurements effectively.
The Arabs used coins as a measurement of units of weight since a minted coin could not easily be cut or shaved to reduce its weight, and thus provided a measurable standard. They used a coin called a silver dirhem as a basic measure of weight, which had a weight roughly equivalent to 45 fully grown grains of barley. Ten dirhems comprised a Wukryeh which was translated into Latin as an "uncia" — the origin of the word "ounce. Over time, trade spread from the Mediterranean area to Europe, including the northern German City States.
As a result, a pound, 16 ounces of silver, or grains, became a commonly used measure in many regions. While England also adopted this measure, a shortage of silver caused King Offa to reduce the measurement of the pound to grains in order to use smaller coins. Eventually, when William the Conqueror became King of England, he retained the grain pound for minting coins, but reverted to the grain pound for other purposes. Though many countries used the pound from that point onward, including England the British pound sterling, or GBP was equal to one pound-weight of silver in King Offa's timethe avoirdupois weight system was adopted during the reign of Queen Elizabeth in the 16th century.
It was a system based on the weight of coal, and its name was derived from the French phrase "avoir de pois" goods of weight or property. The avoirdupois was equivalent to 7, grains, drams of Sincethe avoirdupois pound has been officially defined in most English-speaking countries as 0. Different systems of measurement also developed over time in Asian countries. For example, in ancient India, a measure of weight called the "Satamana" was used, and was equal to the weight of gunja berries.
The measurement of weight was based on the shi, which was equivalent to approximately pounds. The Chi and Zhang were units of length equivalent to approximately 25 centimeters 9. The Chinese also developed a means to ensure accuracy through use of a special size of bowl used for measurements that also made a specific sound when struck — if the sound was off pitch, the measurement was not accurate. InJohn Wilkins proposed a decimal system in which length, area, volume, and mass were linked to each other based on a pendulum that had a beat of one second as a base unit of length.Note: Btu is British thermal units.
Food calories are a measure of energy in food. One food calorie is equal to 1, calories, or 1 kilocalorie. For example, the energy in a food calorie ice cream cone is about the same as the amount of electricity required to light a watt incandescent light bulb for 3.
Scientific notation is a short-hand way of writing a number that has a lot of digits. For example, the numbercould be written as 5. A negative number after the E means the decimal should be moved a certain number of places to the left.
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Renewable energy.If you are buying a window air conditioning unit or a mini split the heating or cooling capacity is almost always in BTU. When refrigeration was first introduced there were several methods for calculating the amount of energy needed.Convert specific heat from degC to degK
One method which became very popular was the amount of energy needed to melt or freeze 1 ton of ice over 24 hours. A machine that could freeze 1 Ton of ice over 24 hours was called a 1 TON unit.
A BTU is the amount of heat or cooling power needed to raise or lower the temperature of one pound of water by one degree Fahrenheit. Since a BTU can measure heating and cooling capacity on a small scale it is often used for window air conditioners and mini split units. Summary If you are thinking about buying an HVAC unit such as a mini split and wonder how the sizes compare to standard home HVAC unit the above conversion table can help. The square feet of a home dictates how big a unit is needed to heat or cool it.
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Learn how your comment data is processed. Most often home air conditioning units will be rated in Tons which can be confusing. Most homes have a TON unit that heats or cools the entire home. Of course, the size can also vary depending on the climate and how well insulated a home is.
U.S. Energy Information Administration - EIA - Independent Statistics and Analysis
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Read this information I have collected about spyware and viruses. Welcome to OnlineConversion. Thousands of units, and millions of conversions. Astronomical Astronomical unit, light-years, parsecs, More Clothing Convert clothing sizes between many different countries. Finance Several calculators and conversions related to finance. Force Dyne, gram-force, poundals, newtons, pounds, kgm-force, More Fun Stuff Several fun and interesting calculators and conversions.
It is the same as the gross heating value or energy content. See Thermodyamics key values internationally agreedStandard state and enthalpy of formation, Gibbs free energy of formation, entropy and heat capacity and Standard enthalpy of formation, Gibbs energy of formation, entropy and molar heat capacity of organic substances.
For compounds containing carbon, hydrogen and oxygen as many organic compounds doa general combustion reaction equation will be:. For ethanol, the constants a, b and c are 2, 6 and 1, respectively, and the chemical equation for the combustion of ethanol:.
This can be converted to kJ per mass units:. The table below shows values of heat of combustion calculated after the above described method. In such cases the general equation applies to also these substances. If it is known that other substances is formed in the cumbustion reactions, the exact products must be known to be able to calculate the heat of combustion. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro.
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Privacy We don't collect information from our users. Citation This page can be cited as Engineering ToolBox, Heat of combustion. Modify access date. Scientific Online Calculator. Acetylene ethyne. Diethyl ether ethoxyethane.
Dimethyl ether methoxymethane. Ethylene ethene. Toluene methylbenzene.