TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition contains 99 - 30 (90 - 50) wt.% of component (1) and 1 - 70 (10 - 50) wt.% of component (2). EXAMPLE - As cooling medium, ethane, nitrous oxide, ammonia and dimethyl ether (DME) are mixed with difluoromethane (HFC-32) in specified blend amounts. Using these cooling media, comparisons of cooling characteristics are carried out as condensation initiation temperature of cooling medium in cooling vessel of 50 degreesC, temperature of cooling medium in evaporation vessel inlet of 0 degreesC, evaporation vessel supercooling temperature of 0 degreesC, evaporation vessel superheating temperature of 0 degreesC.    The cooling ability (kJ/m3) and performance coefficient are given:    Using 0 % ethane, cooling ability is 4990 kJ/m3 and performance coefficient is 4.02; using 20 % ethane, cooling ability is 7700 and performance coefficient is 4.09; using 37 % ethane, cooling ability is 9600 and performance coefficient is 4.1; using 57 % ethane, cooling ability is 11400 and performance coefficient is 3.98; and using 70 % ethane, cooling ability is 12300 and performance coefficient is 3.9.    Using 0 % ammonia, cooling ability is 4990 kJ/m3 and performance coefficient is 4.02; using 12 % ammonia, cooling ability is 4700 and performance coefficient is 4.58; using 25 % ammonia, cooling ability is 4500 and performance coefficient is 4.7; using 43 % ammonia, cooling ability is 4100 and performance coefficient is 4.66; and using 50 % ammonia, cooling ability is 4000 and performance coefficient is 4.64.    Using 0 % DME, cooling ability is 4990 and performance coefficient is 4.02; using 27 % DME, cooling ability is 4200 and performance coefficient is 4.32; using 46 % DME, cooling ability is 3700 and performance coefficient is 4.4; and using 66 % DME, cooling ability is 3100 and performance coefficient is 4.38.    Using 0 % nitrous oxide, cooling ability is 4990 and performance coefficient is 4.02; using 27 % nitrous oxide, cooling ability is 6900 and performance coefficient is 4.04; using 46 % nitrous oxide, cooling ability is 8200 and performance coefficient is 4.05; and using 66 % nitrous oxide, cooling ability is 9400 and performance coefficient is 3.95.