TABLE OF CONTENTS The table below presents conversion factors for common acoustical units to corresponding metric system units, often referred to as le Syst me Internationale d'Unit s (SI units). The basic SI units are expressed as follows: length by meter (abbreviated m), mass by kilogram (kg), time by second (s), and temperature by degree kelvin (K). For a comprehensive presentation of metric system units, refer to "Standard for Metric Practice," ASTM E 380. This publication is available from the American Society for Testing and Materials (ASTM), 1916 Race Street, Philadelphia, PA 19103.
| To convert | Into | Multiply by [*] | Conversely, Multiply by [*] |
|---|---|---|---|
| atmosphere (atm) | lb/in 2 (psi) | 14.7 | 6.8 10 ?2 |
| newtons (N) /m 2 | 1.0132 10 5 | 9.872 10 ?6 | |
| C | F | ( C 9/5) + 32 | ( F ? 32) 5/9 |
| K | C + 273 | K ? 273 | |
| cm | in | 0.3937 | 2.54 |
| ft | 3.281 10 ?2 | 30.48 | |
| mm | 10 | 10 ?1 | |
| m | 10 ?2 | 10 2 | |
| deg (angle) | radians | 1.745 10 ?2 | 57.3 |
| dynes/cm 2 (microbars) | lb/ft 2 (force) | 2.09 10 ?3 | 478.5 |
| N/m 2 | 10 ?1 | 10 | |
| F | C | ( F ? 32) 5/9 | ( C 9/5) + 32 |
| K | ( F + 460) 5/9 | 1.8 K ? 460 | |
| ft | in | 12 | 0.0833 |
| mm | 304.8 | 3.281 10 ?3 | |
| cm | 30.48 | 3.281 10 ?2 | |
| m | 0.3048 | 3.281 | |
| ft 2 | in 2 | 144 | 6.944 10 ?3 |
