does the temperature change the density of water? write down what do you think if you mix cold water and hot water
Answers
when the water is heated it expands increasing in volume. this is represents by increase in size when you will mix cold water and hot water the hot water will rise to the top to, mixing with the cold water along the way creating purple water
Answer:
Yes, the temperature obviously changes density (what do you think happens to density when ice is heated to form water?). But it's just a noticeable change. Change in density also occur when hot water and cold water is mixed because it leads to change in temperature. To understand that completely, let's go to the molecular level. Water, as you see it, acts like a bag with water molecules in it. The water molecules vibrate when energy is provided, and since energy is everywhere, they always vibrate. But sometimes additional energy can be provided, in this case with the increase in temperature as heat energy. The water molecules start to vibrate more vigourously, and increase the intermolecular spaces (think about it as multiple men standing in a line and then they suddenly start to move back and forth, since they need more space so that they can move, they will move apart from each other). Density is the measure of how tightly packed things are. And in the cases of men, when they move furthur, their density decreases when they move away, since they are now less compact. Similarly in the case of water molecules, when water is heated, the vibration of molecules increase and so increases their intermolecular space, and thus the density of water decreases too. The case is inversed when cold water is added to hot water, or when water is cooled. The vibration of molecules decrease because of decreased heat energy, and so they can come closer to each other. And thus the density increses.