Chapter III LEGAL UNITS OF MEASUREMENT REFERRED TO IN ARTICLE 1 (c)X1
United Kingdom
| QUANTITIES, NAMES OF UNITS, SYMBOLS AND APPROXIMATE VALUES | ||
| Length | ||
|---|---|---|
| inch | 1 in | = 2·54 × 10 -2 m |
| foot | 1 ft | = 0·3048 m |
| mile | 1 mile | = 1 609 m |
| yard | 1 yard | = 0·9144 m |
| Area | ||
| square foot | 1 sq ft | = 0·929 × 10 -1 m 2 |
| acre | 1 ac | = 4 047 m 2 |
| square yard | 1 sq yd | = 0·8361 m 2 |
| Volume | ||
| fluid ounce | 1 fl oz | = 28·41 × 10 -6 m 3 |
| gill | 1 gill | = 0·1421 × 10 -3 m 3 |
| pint | 1 pt | = 0·5683 × 10 -3 m 3 |
| quart | 1 qt | = 1·137 × 10 -3 m 3 |
| gallon | 1 gal | = 4·546 × 10 -3 m 3 |
| Mass | ||
| ounce (avoirdupois) | 1 oz | = 28·35 × 10 -3 kg |
| troy ounce | 1 oz tr | = 31·10 × 10 -3 kg |
| pound | 1 lb | = 0·4536 kg |
| Energy | ||
| therm | 1 therm | = 105·506 × 10 6 J |
Until the date to be fixed under Article 1 (c), the units listed in Chapter III may be combined with each other or with those in Chapter I to form compound units.