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§ 1065.1005 Symbols, abbreviations, acronyms, and units of measure.
The procedures in this part generally follow the International System of Units (SI), as detailed in NIST Special Publication 811, which we incorporate by reference in § 1065.1010. See § 1065.20 for specific provisions related to these conventions. This section summarizes the way we use symbols, units of measure, and other abbreviations.
(a) Symbols for quantities. This part uses the following symbols and units of measure for various quantities:
Table 1 of § 1065.1005—Symbols for Quantities
| Symbol | Quantity | Unit | Unit symbol | Units in terms of SI base units |
|---|---|---|---|---|
| α | atomic hydrogen-to-carbon ratio | mole per mole | mol/mol | 1. |
| A | area | square meter | m2 | m2. |
| a0 | intercept of least squares regression | |||
| a1 | slope of least squares regression | |||
| ag | acceleration of Earth's gravity | meter per square second | m/s2 | m· s−2. |
| β | ratio of diameters | meter per meter | m/m | 1. |
| β | atomic oxygen-to-carbon ratio | mole per mole | mol/mol | 1. |
| C# | number of carbon atoms in a molecule | |||
| c | power-specific carbon mass error coefficient | gram per kilowatt-hour | g/(kW·hr) | 3.6−1 · 10−9 · m−2 · s2. |
| Cd | discharge coefficient | |||
| Cf | flow coefficient | |||
| δ | atomic nitrogen-to-carbon ratio | mole per mole | mol/mol | 1. |
| d | diameter | meter | m | m. |
| d | power-specific carbon mass rate absolute error coefficent | gram per kilowatt-hour | g/(kW·hr) | 3.6−1 · 10−9 · m−2 · s2. |
| DR | dilution ratio | mole per mole | mol/mol | 1. |
| ε | error between a quantity and its reference | |||
| ∈ | difference or error quantity | |||
| e | brake-specific emission or fuel consumption | gram per kilowatt hour | g/(kW·hr) | 3.6−1 · 10−9 · m−2 · s2. |
| F | F-test statistic | |||
| ƒ | frequency | hertz | Hz | s−1. |
| ƒn | angular speed (shaft) | revolutions per minute | r/min | π · 30−1 · s−1. |
| γ | ratio of specific heats | (joule per kilogram kelvin) per (joule per kilogram kelvin) | (J/(kg·K))/(J/(kg·K)) | 1. |
| γ | atomic sulfur-to-carbon ratio | mole per mole | mol/mol | 1. |
| κ | opacity | |||
| K | correction factor | 1. | ||
| Kv | calibration coefficient | m4 · s · K0.5/kg | m4 · kg−1 · s · K0.5. | |
| l | length | meter | m | m. |
| L | limit | |||
| µ | viscosity, dynamic | pascal second | Pa·s | m−1 · kg · s−1. |
| M | molar mass 1 | gram per mole | g/mol | 10−3 · kg · mol−1. |
| m | mass | kilogram | kg | kg. |
| m | mass rate | kilogram per second | kg/s | kg · s−1. |
| v | viscosity, kinematic | meter squared per second | m2/s | m2 · s−1. |
| N | total number in series | |||
| n | amount of substance | mole | mol | mol. |
| n | amount of substance rate | mole per second | mol/s | mol · s−1. |
| P | power | kilowatt | kW | 103 · m2 · kg · s−3. |
| PF | penetration fraction | |||
| p | pressure | pascal | Pa | m−1 · kg · s−2. |
| ρ | mass density | kilogram per cubic meter | kg/m3 | m−3 · kg. |
| Δp | differential static pressure | pascal | Pa | m−1 · kg · s−2. |
| r | ratio of pressures | pascal per pascal | Pa/Pa | 1. |
| r2 | coefficient of determination | |||
| Ra | average surface roughness | micrometer | µm | 10−6 · m. |
| Re# | Reynolds number | |||
| RF | response factor | |||
| RH | relative humidity | |||
| σ | non-biased standard deviation | |||
| S | Sutherland constant | kelvin | K | K. |
| SEE | standard error of the estimate | |||
| T | absolute temperature | kelvin | K | K. |
| T | Celsius temperature | degree Celsius | °C | K−273.15. |
| T | torque (moment of force) | newton meter | N·m | m2 · kg · s−2. |
| θ | plane angle | degrees | ° | rad. |
| t | time | second | s | s. |
| Δt | time interval, period, 1/frequency | second | s | s. |
| V | volume | cubic meter | m3 | m3. |
| V | volume rate | cubic meter per second | m3/s | m3 · s−1. |
| W | work | kilowatt-hour | kW·hr | 3.6 · 106 · m2 · kg · s−2. |
| wC | carbon mass fraction | gram per gram | g/g | 1. |
| x | amount of substance mole fraction.2 | mole per mole | mol/mol | 1. |
| X ~ | flow-weighted mean concentration | mole per mole | mol/mol | 1. |
| y | generic variable | |||
| Z | compressibility factor |