Question: Which is denser, hot water or cold water? How can you tell from lowering vials of hot water and cold water into a cup of room temperature water?
Reference answer: Cold water is denser. Cold water sinks to the bottom of room temperature water. Hot water and less dense things float on room temperature water.

Student answer: Cold. I know because things that are denser than water sink. The cold water sinks, so it is denser than room temperature water.

Student answer: Hot. Hot water is denser than room temperature water because most of the hot water will go to the top of the cup.

Student answer: Hot. I know because the hot water goes to the bottom of the cup which means hot water is more dense than water.

Student answer: Hot. Because hot makes water evaporate faster.

Student answer: Cold water. I know this because when you put a cup of cold water into a cup that is room temperature it goes to the bottom, whereas warm water goes to the top.

Student answer: Cold. If it was less dense it would have floated to the top like the block of wood question, but it did not so it is denser.

Student answer: Hot. Because the heat goes on top first then it starts to spread.

Student answer: Cold. I know cold water is less dense because the water stayed where it was.

Student answer: Hot. Because the hot water stayed in the vial and the cold water went into the cup.

Student answer: Cold. Because cold water goes to the bottom.

Student answer: Hot. When we did hot and cold water the hot water was more dense.

Student answer: Cold water. Because the sun is up high and far from the earth but the moon is closer to earth so it just like the moon is down and the sun is up!

Student answer: Hot. The hot water sunk when it hit the water.

Student answer: Cold water. The hot water is on top so it is less dense than cold water.

Student answer: Cold. In an experiment we did, the cold water sank to the bottom of the cup.

Student answer: Cold. Because if you were to put the cold in the hot, the cold water would stay, but if you were to put hot water in cold it would float.

Student answer: Cold. Because cold water moves to the bottom of the cup.

Student answer: Hot. I know because hot water has more air bubbles in it because of expansion.

Student answer: Cold. Because I did this experiment and I figured out that cold water is denser.

Student answer: Cold. If you put hot and cold water in the same cup, the cold water would be at the bottom, and the one at the bottom is denser.

Student answer: Hot. Because we experimented it.

Student answer: Hot. Well hot water goes up.

Student answer: Cold. I know because at school I learned that cold water is denser than hot water because we did an experiment like the one above.

Student answer: Cold. Because it is cold water.

Student answer: Cold. Because cold water is mostly felt at the bottom of the cup of cold water.

Student answer: Cold. Because the hot water would go to the top of the cup and the cold would stay in the vial. Some may escape the vial and go to the bottom of the cup.

Student answer: Cold. I know because the cold water molecules contract instead of expand.

Student answer: Cold water. I know because when you lower the vial of cold water into room temperature water, the cold water would stay in the bottom of the vial because if something is more dense, it would sink.

Student answer: Hot. Because when you lower a vial of hot water it goes up, but when you put a vial of cold water it stays in there.

Student answer: Cold. Cold water is denser because density sinks to the bottom of a cup, or anything.

Student answer: Cold. Hot water goes to the top of a glass and cold water goes to the bottom or stays in the vial.

Student answer: Hot. Cold water's temperature is cold so it will go under and not dense so it is hot water.

Student answer: Cold. I know because when we put the vial of cold water into room temperature water it stayed in the vial and some went to the bottom. If it does that it means that it is more dense than hot water because the hot water went to the top of the cup, which makes it less dense.

Student answer: Cold water. I know because when you lower the vial of cold water into room temperature water, the cold water would stay in the bottom of the vial because if something is more dense, it would sink.

Student answer: Cold. Because the cold water stays in the vial or when it gets out, it goes to the bottom of the cup.

Student answer: Cold water. Hot water is less dense so it rises, and cold water is more dense because it goes to the bottom.

Student answer: Cold. The less denser it is it would go on the top and the more denser, it goes all over the place.

Student answer: Cold. Because the hot water will float on the cold water.

Student answer: Cold. Because cold water stays at the bottom.

Student answer: Cold. Because cold water sinks.

Student answer: Cold. When something is denser, it sinks. The hot water floated up, but the cold water stayed down.

Student answer: Cold. Because when you put the cold water in the water it melt.

Student answer: Cold. I know because the hot water goes to the top of the water which means it is less dense so then that means cold water is more dense.

Student answer: Cold. Because we did an experiment and that is what happened.

Student answer: Cold. Because the cold water stays in the cup.

Student answer: Hot. Because the hot water went to the top.

Student answer: Cold. Cold water goes to the bottom of the cup. Hot water goes to the top of the cup.

Student answer: Cold. Because it went to the bottom.

Student answer: Hot. I know because the hot water is at the bottom of the cup.

Student answer: Cold. Cold water sinks to the bottom of a room temperature cup of water.

Student answer: Cold. Cold water sinks to the bottom and the hot water does not.

Student answer: Hot. The hot water went to the top.

Student answer: Cold. Because if the cold water was blue and you put it in, it sinks to the bottom.

Student answer: Cold. If something is denser than something, it sinks.

Student answer: Cold. Because it sinks and that means it is heavier and that means it is denser.

Student answer: Cold. Because hot water is less dense than cold water.

Student answer: Cold. Cold water is denser than hot water.

Student answer: Cold. Cold water goes to the bottom.

Student answer: Cold. Because when hot water is boiling the water wants to get out of the cup so it evaporates. But when you have freezing water it freezes and turns to ice.

Student answer: Cold. The hot water floated and the cold water sank.

Student answer: Hot. Heat rises and floats.

Student answer: Cold. Because when water molecules are cooled, they want to come close together or contract. This makes it denser.

Student answer: Cold water. Because the hot water goes out of the vial and the cold stays weighed down because it is more tightly packed.

Student answer: Hot. Warm water expands to the top and when water molecules are cold they come together to the bottom.

Student answer: Cold. Because we did the experiment in class.

Student answer: Cold. Because when something is denser it sinks and in this case the it is the cold water. The cold water sank or stayed in the vial but the hot water floated to the top. Hot water is less dense.

Student answer: Hot. Because when something is less dense than water it expands and weighs less and floats. When water is denser it sinks because it contracts and gets lighter than water and sinks.

Student answer: Hot. Because the water like almost sank.

Student answer: Cold. Because cold water is denser and the hot water less dense.

Student answer: Hot. When a toy is denser it floats. When a toy is less dense it sinks which is the exact opposite.

Student answer: Cold. The cold water does not float up like the hot water does. Mostly it just stays in the vial.

Student answer: Cold. Because when something is denser it means there is this little space and a lot of stuff in it.

Student answer: Cold. I know because when something is less dense it floats and if something sinks it is dense.

Student answer: Cold. Because when you lower a vial of cold water into room temperature water, it sinks to the bottom.

Student answer: Cold. Because the cold water is more dense than the water.

Student answer: Cold. Because the cold water goes down and when something goes down it is denser.

Student answer: Cold. Because cold water sinks in room temperature water and when something sinks in water it is denser than water.

Student answer: Neither. Because I did it in class before.

Student answer: Cold. Because when cold water gets cool it cont.

Student answer: Hot. Because done this same thing before.

Student answer: Hot. Because denser means it wants to contract. Less dense means it wants to expand. The hot water contracted and squeezed to the bottom.

Student answer: Cold. Cold water goes to the bottom of the room temperature water. The room temperature water tries to push the cold water so it can take over the vial.

Student answer: Hot. Because dense means fills up more space.

Student answer: Hot. Because the hot water is so hot the water rises.

Student answer: Cold. The cold water goes down and the warm water goes up.

Student answer: Cold. Hot water goes up but cold water goes down.

Student answer: Cold. Because when you put the vial in cold water it went down.

Student answer: Hot. Because you can put something in a cold one and hot it sinks in an hot water.

Student answer: Hot. Because when we did our experiment the hot water floated and the cold water stayed at the bottom.

Student answer: Cold. Because hot water floats and cold water sinks.

Student answer: Because if the water floats, it is less dense. If it goes down to the bottom, it is denser.

Student answer: Cold. Because hot water floats which means it is less dense than cold water. Cold water sinks which means it is denser than hot water.

Student answer: Cold. Because cold water is denser.

Student answer: Cold. Because cold sinks to the bottom and hot floats.

Student answer: Cold. Because the more denser something is it goes to the bottom and that is what cold water does.

Student answer: Cold. Because cold water contracts so it sinks. But hot it expands, it is lighter so it floats.

Student answer: Cold. Because cold water sinks.

Student answer: Cold. Because the cold went straight to the bottom and the hot went straight to the top.

Student answer: Cold. Because when you put cold water into room temperature it would stay dense and it will not float up to mix around with room temperature.

Student answer: Cold. Because the cold water sank in the cup and the hot water floated.