On a hot day, Sora put water in a tray and put it in the freezer. The next morning, the water had turned to ice. Ice is a solid, so it keeps its shape.
Sora left a piece of ice in a glass. The warm air made the ice melt. Soon it was water. Water is a liquid, so it takes the shape of the glass.
At lunch, Mom heated water in a pot for noodles. Soon it began to boil, with lots of bubbles. Some of the water turned to steam and went up in the air. Steam is a gas.
Mom said, "Be careful, because steam is very hot." Then she said, "Ice, water, and steam are all water. Water can freeze when it gets very cold. It can boil when it gets very hot."
Water freezes at zero degrees Celsius. It boils at one hundred degrees. That night, Sora made ice pops with grape juice. She will eat them tomorrow.