A generalized equation to describe surface boiling of liquids is derived. The expression which correlates all fluid independently of pressure and heating surface-fluid combination is Display Formula The form of the relation was obtained from a simplified model of heat transfer to the bubbles close to the heated surface. The coefficient BL, determined empirically, was found to be a function only of the product ρVhfg and is shown in Fig. 4. Good agreement between test results and the derived equation was obtained for pool boiling and nucleate boiling heat transfer of subcooled and vapor-containing liquids.