257 W/m²·K = 45.2603 BTU/hr·ft²·°F
| W/m²·K | BTU/hr·ft²·°F |
|---|---|
| 242 W/m²·K | 42.6187 |
| 247 W/m²·K | 43.4992 |
| 252 W/m²·K | 44.3798 |
| 257 | 45.2603 |
| 262 W/m²·K | 46.1409 |
| 267 W/m²·K | 47.0214 |
| 272 W/m²·K | 47.902 |
257 W/m²·K = 45.2603 BTU/hr·ft²·°F
1 W/(m²·K) = 0.176110 BTU/(hr·ft²·°F) · 1 BTU/(hr·ft²·°F) = 5.67826 W/(m²·K)