Do a sugar cube dissolve in cold coffee?

Yes, a sugar cube will dissolve in cold coffee, but it will take longer than in hot coffee.

Here's why:

* Solubility: Sugar is more soluble in hot water than cold water. This means that more sugar can dissolve in a given amount of hot water compared to cold water.

* Temperature: Cold coffee has a lower temperature than hot coffee. The lower the temperature, the slower the rate of dissolving.

* Agitation: Stirring or shaking the cold coffee will help the sugar dissolve faster, but it won't be as fast as if the coffee was hot.

So, your sugar cube will eventually dissolve in cold coffee, but it will be a slower process than in hot coffee.