Final answer:
The contents of the bucket are in a liquid state, having a fixed volume but taking the shape of the container. Upon heating, the liquid would change into a gaseous state, demonstrating how matter changes form with the addition or removal of heat.
Step-by-step explanation:
The state of matter observed in the bucket by the girl indicates that the contents were in a liquid state. When we talk about the phases of matter, solids, liquids, and gases are the primary states. A solid maintains a definite shape and volume. In contrast, a liquid has a definite volume but takes the shape of its container. Finally, a gas does not have a definite shape or volume, as it expands to fill the entire container it is in. When matter is heated, it can change from solid to liquid to gas, and when it is cooled, it changes from gas to liquid to solid. So, if the contents of the bucket, which are now in a liquid state, were to be heated enough, it would eventually change to a gaseous state.