Question: Why does the level of the water in the straw go up when the bottle-and-straw thermometer is heated?
Reference answer: Water expands when water is heated.

Student answer: Because the hotness is causing the thermometer temperature go down.

Student answer: This happens because when something is heated and because it has less density the temperature goes up.

Student answer: The water expands when heated so when you heat up the water the water goes up the straw.

Student answer: Because hot water expands and cold water contracts.

Student answer: Because all the molecules do not like hot water so they go somewhere else the only way to go is up.

Student answer: It goes up because the heat pushes it up. It cannot go anywhere but up. It is also less dense.

Student answer: Because hot water makes stuff hot. Hot water with warm water makes it and evaporate.

Student answer: Because the warm water is less dense so it goes up.

Student answer: This happens because hot water is less dense than regular water so the water volume starts to go up or starts to expand.

Student answer: Because hot water has a lot of density so it goes down.

Student answer: Because when water is heated water has nowhere else to go besides up so the water goes up.

Student answer: The hot water heats the thermometer.

Student answer: Because heated water is less dense.

Student answer: Since the water in the thermometer is heated, it becomes less compact; causing the water level to expand.

Student answer: When water is heated the water level goes up because of the density. Less dense.

Student answer: Because hot water is less dense than room temperature so it will rise.

Student answer: It happens because hot water expands when it is heated.

Student answer: The water goes down, because it does not take up as much space.

Student answer: Because if it were a thermometer hot water is hot so it would rise.

Student answer: The straw was in the water and sucked in some water.

Student answer: It happens because it is expanding.

Student answer: Because it expands.

Student answer: Density.

Student answer: It goes up because it is less dense than regular water.

Student answer: Because the water is less dense so it forces it to expand.

Student answer: Well it happens by heating it.

Student answer: Because the water expands.

Student answer: It happens because when water gets hot it expands making the thermometer level to rise.

Student answer: The water goes up because it expands.

Student answer: It happens because warm water is less dense than cold so when cold goes up hot water goes down.

Student answer: The water is heated so the water expands.

Student answer: This happens because the heated water is expanding.

Student answer: When room temperature water is touching hot water it will go up.

Student answer: The water expands when heated.

Student answer: The water inside expands when the water on the outside is hot.

Student answer: This happens because water expands when heated.

Student answer: Because when you heat something up it goes higher and higher.

Student answer: Because when it is in hot water it expands.

Student answer: When water is heated it expands.

Student answer: Because the hotter it is the higher it goes up.

Student answer: It is like when steam comes out of the dish washer the steam starts going up not down. Because steam is less dense.

Student answer: Because there is a lot of hot water.

Student answer: Because it is warm water.

Student answer: The water goes up because hot water is less dense.

Student answer: Because when it is heated the hot or cold water goes up.

Student answer: Because the hot water expands.

Student answer: The water level goes up because the hot water is less dense so it floats to the top.

Student answer: Because hot water expands meaning it floats and that it is less dense.

Student answer: Because hot water is less dense and it expands.

Student answer: This happens because when the water is heated it expands or gets bigger.

Student answer: When water is heated it expands.

Student answer: Because the hot water is less dense than room temperature water. The water expands when the thermometer is placed in hot water.

Student answer: Because warmth rises and since it is warm water the warmth is trying to get out.

Student answer: The hot water expands.

Student answer: The water turns warm and it grows because warm water is dense so it has to go to the top.

Student answer: Because when the water is heated the warmer water is less dense.

Student answer: The water expands when heated which means it takes more room.

Student answer: Water expands when heated.

Student answer: It pushes it up because it expands and pushes it up.

Student answer: Because there was hot water in the bottle with green in it and hot water can go up from steam.

Student answer: It is like a thermometer and since the hot water is denser it makes the cold water up because it has to expand.

Student answer: Because hot water is less dense so it goes up.

Student answer: The warm water is denser than the regular water and that makes it to go up.

Student answer: When water is heated it expands.

Student answer: The volume of the hot water pushes the water.

Student answer: Because the molecules are heated and move away from each other.

Student answer: The water becomes less dense so it spreads out.

Student answer: When the molecules get hot they want to jump around. So the water goes up.

Student answer: Because the hotness causes it to go up.

Student answer: Because with a thermometer when it is hotter the temperature goes higher.

Student answer: Because when molecules get warm, they want to spread out so the water rises.

Student answer: Because when water molecules are warm they like to expand.

Student answer: Because when you put hot water into room temperature water it will rise up. Because the water in the bottle is cold and not in the bottle is not cold.

Student answer: Because the water in the thermometer is room temperature water and hot water is less dense than room temperature water causing it to float or rise.

Student answer: It happens because warm water is less dense so it will go up.

Student answer: Because the warm water is less dense so it expands.

Student answer: Because it is making it expand.

Student answer: Because when I put it in the water it stays the same.

Student answer: The hot water is more dense it is getting more dense.

Student answer: Because hot water expands.

Student answer: When the water in the bottle is heated it goes up because it has no other place to go which means it is less dense which is expanding.

Student answer: Because the hot water is less dense.

Student answer: Because warm water is denser than cold water. When a substance is denser it squeezes up in a small space.

Student answer: Because the hot water is less dense than room temperature water and when temperatures get warmer they go up.

Student answer: Because it is a thermometer and hot water goes up and cold water goes down.

Student answer: Because the is so warm that when you put a straw the water goes up.

Student answer: Because when water is heated it goes up and makes steam.

Student answer: Hot water is more dense.

Student answer: Because the water is hot very hot not like cold water.

Student answer: Because the hotness shoots it up.

Student answer: Because hot gives it nowhere else to go.

Student answer: Because the atoms spread and make it higher, so the atoms take up more space.

Student answer: It goes up because it is warm.

Student answer: When water gets heated it expands and gets larger.

Student answer: Because hot water is less dense.

Student answer: Because it has nowhere else to go but up and it expands and takes up more space.

Student answer: Because it put pressure and it pushed it up it maybe can be surface tension.

Student answer: Because hot water is less dense than cold water so it goes up and surface tension.

Student answer: Because the water expands.

Student answer: This happens because hot water expands which goes higher.