Based on the context and the answer, generate a question. 

Context: It has been miserably cold , and raining as well . It was so cold in the kitchen that we had the novel experience of opening the frig door and having warm air come out . When we have our evening glass of champagne the glasses are colder than the liquid , so you get half an inch in the bottom of the glass and the rest is froth .

Answer:

The warmer wine reacts to air and the cold glass and bubbles .



What is the reason there is so much froth in the champagne glass ?