one example of a physical change is
water to ice ?
water to steam ?
https://www.thoughtco.com/physical-and-chemical-changes-examples-608338
One example of a physical change is melting ice. To understand why this is a physical change, let's first define what a physical change is. A physical change is a change that alters the form or appearance of a substance without changing its chemical composition.
In the case of melting ice, the process involves heating the ice, which increases its temperature. As the temperature rises above the freezing point of water (0 degrees Celsius or 32 degrees Fahrenheit), the ice starts to change from its solid state to a liquid state, forming water. This change in state is a physical change because the chemical composition of water remains the same; only the physical properties, such as shape and state, are altered.
To observe the physical change of melting ice, you can conduct the following experiment:
1. Take a small amount of ice cubes and place them in a clean container.
2. Record the initial temperature of the ice.
3. Gradually apply heat to the ice, either by using a heat source like a burner or leaving it at room temperature.
4. Observe the changes in the ice as it starts melting.
5. Measure the final temperature of the liquid water formed.
By performing this experiment, you can directly observe the physical change of the ice transforming into liquid water through the melting process.