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Jun 27, 2019 · A conversion factor is the number or formula you need to convert a measurement in one set of units to the same measurement in another set of units. The number is usually given as a numerical ratio or fraction that can be used as a multiplication factor.
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A conversion factor is a number that is used to change one set of units to another, either by multiplying or by dividing. An appropriate conversion factor makes calculation quick and easy. For example, the appropriate conversion value, to convert inches to feet, is 12 inches = 1 foot.
Jan 13, 2010 · Unit conversion is a multi-step process that involves multiplication or division by a numerical factor, selection of the correct number of significant digits, and rounding.
Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.
- Introduction
- Background
- Examples Illustrating The Use of The Conversion Factors
- Summary
- References
Today it is very important to be able to understand measurements in both the English system of units and the SI (Systems International) system of units. The SI system of units (often referred to as the metric system) is the official system for measurements in nearly all countries of the world, but not in the U.S. As our society and economy become m...
Table 1 presents the conversion multiplication factors to convert from English units to SI units (and vice versa) for basic measurements including length, weight, area, volume, bulk density, mass flow rate, volume flow rate, pressure and power. Additional conversion factors are presented for energy, energy density, and energy yields. SI prefixes in...
Example 1
A field is 160 acres and you want to express that area in hectares. Find the Areacategory in Table 1. Since the known unit is "Acres", find the numeral "1" under the acre column. Follow that line to the right to find the corresponding multiplication factor of 0.4047 under the hectare column. The area of the 160 acre field in hectares is 64.8 hectares (160 x 0.4047). For another exercise involving area, calculate how many sq ft (square feet) are in a plot that is 0.6 hectare. Find the numeral...
Example 2
Energy content of buckwheat is 15.5 MJ/kg (Mega Joules per kilogram). What is the energy density in units of BTU/lb? Go to the category of Energy Densityin Table 1 and find the column for MJ/kg. Locate the numeral "1" under that column and then read to the left to get the multiplication factor of 429.922 under the BTU/pound column. The energy density of the buckwheat as 6,664 BTU/lb (15.5 x 429.922).
Example 3
An electric resistance heating system rated at 25 kW is to be replaced with a propane furnace. What BTU/Hr rating of propane furnace is needed for the same heating capacity? Under the Powercategory in Table 1, locate the numeral "1" under the kW column. Then under the BTU/Hr column, find the multiplier of 3,412. The BTU/Hr rating of the propane furnace to be equivalent to the electric heating system is 85,300 BTU/Hr (25 x 3,412).
Careful attention to dimensions cannot be over-emphasized. The consistent use of the conversion factors and equations presented in this fact sheet should practically eliminate any errors associated with converting from the English system of units to the SI system and vice versa. Contemporary global systems for communications, commerce, and finance ...
ASHRAE Handbook of Fundamentals, Atlanta, GA, 2005.Marks' Standard Handbook for Mechanical Engineers, 2006.Feb 15, 2018 · A conversion factor is a factor that is used to change between units, and therefore gives the relationship between two units. Explanation: For example, a common conversion factor would be. 1 km = 1000 m. or. 1 minute = 60 seconds.
A conversion factor is a ratio that expresses how many of one unit are equal to another unit. For example, there are 12 in. in 1 ft, 1609 m in 1 mi, 100 cm in 1 m, 60 s in 1 min, and so on. Refer to Appendix B for a more complete list of conversion factors. In this case, we know that there are 1000 m in 1 km.
