Science Project Part 2
Updated: 2/10/2021
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#### Storyboard Text

• Boiling
• During this phase change density decreases because water is more dense than water vapor. Water is more dense than water vapor because water vapor has atoms that are farther apart than the atoms in water.
• First we have boiling, which is a form of vaporization. This makes water boil and turn in gas. Water boils at 100 degrees celsius.
• Boiling
• In addition, the speed of atoms increases because the atoms move faster when heated up and gain space between each other.
• Also, during this phase change temperature changes. Before the phase change the temperature is climbing to 100 degrees celsius, but during the phase change the temperature stays the same. After the phase change the temperature rises again. The reason the temperature rises is because the average thermal energy increases which means that the temperature increases.
• Melting
• The speed of atoms increases as the thermal energy does because the faster the atoms move the more thermal energy an object has. So if thermal energy increases when the temperature increases and the ice melts then ﻿the speed of the atoms must increases as well.
• ﻿ Next we have the melting process which occurs when a solid becomes a liquid. During the melting process the temperature rises to 0 degrees celsius, but then stays at zero until the phase change is over. After the phase change the temperature can continue to rise. This happens because the amount of thermal energy increases.
• Melting and Freezing
• Also, the melting process normally decreases the density of the object but with the substance water, water is more dense than its solid form (ice). So the melting process increases the density of water. This happens because ice floats in water which means it is less dense, so density increase when ice turns to water.
• Freezing
• Also, temperature decreases to 0 degrees celsius before the freezing process begins, but then stays the same until the process is over. When the process is over the temperature will begin to decrease again. The temperature decreases because the particles begin moving slower which makes less thermal energy which makes the temperature lower.
• The End
• ﻿In conclusion, we learned all about the phase changes, and about how atoms are arranged on a molecular level.
• ﻿﻿That was a great experiment, and we learned so much. Thanks for reading!
• ﻿Freezing is the process of a liquid becoming a gas. When water freezes it becomes less dense because ice floats in water, so ice is less dense than water.
• ﻿In addition, the atoms move around quickly and easily before the phase change, but after the change the atoms can only vibrate in place and they move slower.