Some companies want to save some money for the summers.

At _______, a special machines freezes water in huge tanks.

The companies are cooling their buildings with ________.

During the day, _____ blow over the cold tubes.

Using water or ice to cool rooms is new.

In _______, people used to cool homes by hanging wet grass mats over windows.

A doctor in ______ blew air over buckets of ice.

Ice cooling has many _____.

How much electricity is saved? It's enough to power ____ homes.

Making electricity gives off _____.

Ice cooling is like taking _____ cars off the roads.

The cooling systems in the article use the power of ______.

Three states of matter are solid, liquid, and _____.

A solid's particles hold each other tightly.