1. Heat of Fusion: When ice melts, it absorbs heat from its surroundings. This absorbed heat is called the heat of fusion, and it's the energy required to break the hydrogen bonds that hold the water molecules in a rigid crystalline structure (ice) and allow them to move more freely as liquid water. This process pulls heat away from whatever the ice is in contact with, making it feel cooler.

2. Specific Heat Capacity: Water has a high specific heat capacity, which means it takes a lot of energy to raise the temperature of water by a certain amount. Even though ice is technically colder than liquid water, it still has a high specific heat capacity. When you put ice in a drink, for example, it takes energy from the drink to raise the ice's temperature to the point of melting. This process also cools the drink.

Here's a simple analogy:

Imagine you're holding a hot stone. The stone is transferring heat to your hand, making it feel hot. Now imagine putting the hot stone in a bucket of cold water. The water absorbs the heat from the stone, causing the stone to cool down and the water to warm up slightly. The water has a high heat capacity, so it can absorb a lot of heat before its temperature changes significantly.

Similarly, ice absorbs heat from its surroundings, making the surroundings feel cooler.