vaporizationpressure=force/areapressureboilingdirectlyproportionalmeltingpointboilingpointliquidevaporationviscositycrystallinesolidgasmeltingboyle'slawsublimationamorphoussolidcondensationpv=nrtcharles'slawsolidfreezingsurfacetensionfluidinverselyproportional