I suspect it has something to do with static electricity.
On coffee based beverages, or in milkshakes usually.
When you bring a charged rod close to a foam coffee cup, you induce.... Charge Polarization
The foam contains air, which is a poor conductor of heat.
Frappe is one term and another is a foam.
Latte art is becoming very popular around the world. It is when a picture is placed on top of the coffee using the foam.
Soap and foam will leave a ring of scum around your bathtub that you will have to scrub.
A coffee press, French Press, or a cafetière, is used to brew coffee. However, if you wish, you can use it to make milk foam.
Viscosity breakdown
Styrofoam, along with most other expanded plastics, is a very poor insulator of heat and electricity, thereby making a foam coffee cup a very good insulator.
Coffee, milk foam and cinnamon or chocolate sprinkled on top.
well it all depends on who is making the coffee
No it's heterogeneous. (The foam is a different phase to the actual coffee)