Steam milk to milk into a gas, foam milk is in the milk into the gas a join to the same amount of espresso and steam foam milk mixed with Italian coffee, the color of this coffee like cappuccino church friars dark brown hood, cappuccino coffee so named. A traditional cappuccino is one-third espresso, one-third steamed milk and one-third frothed milk. Steam milk means that the milk is gassed, while frothed milk means that gas is added to the milk (also known as milk froth). These two are inseparable from cappuccino. There is no separate steam milk and frothed milk sold in the market, so there is no way to compare!