Making their own clouds scientists have discovered a new way that fat water droplets take shape. Carbon-containing molecules envelop the exterior of developing droplets and reduce surface tension, allowing more water to condense onto the drop. This results in droplets that are about 50 percent wider

See the source article by following the link below:
Making their own clouds scientists have discovered a new way that fat water droplets take shape. Carbon-containing molecules envelop the exterior of developing droplets and reduce surface tension, allowing more water to condense onto the drop. This results in droplets that are about 50 percent wider