Nearly early modern mixed drink involves ice. You can make amazing drinks with rudimentary spirits and MacGyver equipment, but without ice, the drink falls flat. Besides the obvious cooling effect, ice also dilutes the drink, reducing the overall percentage of alcohol and increasing the volume. While dilution might seem non-desirable, trust me – you want it, at least up to a certain point. Our palates are tuned to a particular flavor intensity, and without adding water the flavors would be too intense.
When it comes to using ice in drinks, here’s a fun science fact most folks don’t know: There’s a direct relationship between the amount of cooling and the resulting amount of dilution. Here’s why: Heat energy naturally flows from warmer to cooler, e.g from your warm(er) liquid ingredients to your colder ice. Let the mixture sit long enough and a near equilibrium is established – The liquid and the ice both at nearly 0 degrees Celsius (32F), and the ice melting only very slowly. Most of us have observed this firsthand on many occasions with an ice filled glass of soda.