I'm in a restaurant and order a glass of water. What I get is about 50% water 50% ice cubes. So, after finishing my water, I'm left with half a glass of ice cubes. I'm in a hurry, so need to leave as soon as possible, but I do not want to waste half a glass of (potential) water, so I want the ice to melt as quickly as possible.
What can I do to get the ice cubes to melt as quickly as possible?
The two most promising options that I can think of are:
- Leave enough liquid (i.e. water) in the glass so that the ice cubes are fully submerged. Here the water around the ice would be about 0°C, but water conducts heat rather well.
- Periodically drink the molten ice so that the ice cubes are not submerged, but instead surrounded by air. Here I could regularly blow into the glass and therefore have an air temperature of about 25-30°C around the ice cubes. Air doesn't conduct heat very well, so this might in fact be slower.
For additional melting speed I could also hold the glass in my hands.
So what is the fastest way to melt the ice cubes?