PHASE CHANGE IS UBIQUITOUS AND KINETIC THEORY IS WIDELY USED TO DESCRIBE LIQUID-VAPOR PHASE CHANGE BUT ACCURATE VALUES OF EVAPORATION COEFFICIENT AND CONDENSATION COEFFICIENTS ARE STILL LARGELY UNKNOWN. FOR WATER ALONE DECADES OF RESEARCH HAS YIELDED PHASE CHANGE COEFFICIENTS THAT SPAN SEVERAL ORDERS OF MAGNITUDE. EVAPORATION AND CONDENSATION COEFFICIENTS ARE ESSENTIAL IN ANALYZING LIQUID-VAPOR PHASE CHANGE PROCESSES. SEVERAL RESEARCHERS MAKE TWO PRIMARY ASSUMPTIONS TO SIMPLIFY THE ANALYSIS: (1) THE EVAPORATION COEFFICIENT IS EQUAL TO THE CONDENSATION COEFFICIENT (2) THE LIQUID-VAPOR INTERFACE TEMPERATURE IS EQUAL TO THE VAPOR TEMPERATURE. BOTH ASSUMPTIONS HAVE BEEN SHOWN TO INTRODUCE ERRORS. A NEW METHODOLOGY TO DETERMINE THE EVAPORATION AND CONDENSATION COEFFICIENTS IS PROPOSED USING THE CONSTRAINED VAPOR BUBBLE (CVB) EXPERIMENTAL DATA. INTERFEROMETRIC IMAGE ANALYSIS OF THE CVB DATA ENABLES THE RECONSTRUCTION OF THE LIQUID-VAPOR INTERFACE TO ACCOUNT FOR ENHANCED EVAPORATION AT THE CONTACT LINE. THE THERMAL DATA FROM THE EXPERIMENTS ALLOWS FOR THE DETERMINATION OF THE OUTER WALL HEAT TRANSFER CHARACTERISTICS AND THE NET HEAT TRANSFER TO THE VAPOR BUBBLE. THE FACT THAT THE CVB CELL IS A CLOSED SYSTEM ALLOWS FOR ADDITIONAL CONSERVATION EQUATIONS SUCH THAT THE COMMON ASSUMPTIONS STATED ABOVE ARE NOT MADE. THE CVB CONFIGURATION ALONG WITH THE INTERFEROMETRIC IMAGES PRESSURE AND THERMAL DATA ALLOWS FOR THE INVESTIGATION OF COMMON ASSUMPTIONS MADE IN KINETIC THEORY AND FOR THE FIRST TIME DETERMINE BOTH THE EVAPORATION AND CONDENSATION COEFFICIENTS FROM A COUPLED ANALYSIS. THE METHODOLOGY PROPOSED IS NOT LIMITED TO THE FLUID AND IS APPLICABLE TO ANY PURE WETTING/PARTIALLY WETTING FLUID IN THE CVB SETUP. IN ADDITION TO THE DEVELOPMENT OF A NEW METHODOLOGY THE PROPOSED WORK HAS THE POTENTIAL TO ADDRESS FUNDAMENTAL QUESTIONS REGARDING COMMONLY MADE ASSUMPTIONS IN THE KINETIC THEORY OF PHASE CHANGE. THE RESULTS OF THE PROPOSED RESEARCH WILL HAVE FAR REACHING IMPLICATIONS BEYOND SPACE TECHNOLOGY TO APPLICATIONS INCLUDING AEROSOL TRANSPORT IN THE ATMOSPHERE ATMOSPHERIC SCIENCE AND CLIMATE MICRO- AND NANO-SCALE THERMAL TRANSPORT IN MEMS APPLICATIONS.