why does water not expand when heated
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Why does water expand when heated? water does expand when it freezes because water is polar and so pushing the molecules close together actually makes them feel a force of repulsion, hence they move apart, so it expands. In general, materials expand when heated and contract when cooled...you are trying to apply the logic that if water expands when its cooled then it must contract when heated...but this is only true between the liquid and solid states. If you heat water to be a gas (steam) then it expands just like normal materials do when heated. When heated you put more energy into the atoms so if you put them in a box it will push harder against that box (which you see as pressure) or if you allow the box to expand then it will to equalize the pressure (i.e. expanding makes the pressure less).
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At what temp. do the competing effects of contraction & expansion produce the smallest volume for water? Rating Newest Oldest. Best Answer: 4°C, the temperature of maximum density for water. Below that temperature, and the water starts to expand as the crystalline lattice begins to form. Above that temperature, the density drops because of the increased molecular vibrational activity.
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Warm water expands? Well if it didn't expand when it was frozen then its density would not decrease. I'm sure everyone is familiar with ice cubes that are less dense then water floating on the surface. If ice did not do not then there would be an awful positive feedback loop that would freeze more of the world's ocean waters. The frozen water on hte surface is able to be heated by the sun's radiation, but if were not able to float it would sink to the bottom. quasi426, Apr 13, 2006 Jan 28, 2007 #9
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- Between 3'C and 0'C water does expand with a decrease in temperature. Water… at 3'C is the densest; water at 0'C is the lightest. This is the only interval for Ice I on which it expands with decreasing temperature.
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Water Heater Thermal Expansion Tanks 1 Saves water & energy: unlike a pressure relief valve that wastes heated water when activated, these tanks allow the expanded water to be stored in the tank for future use. 2  Durable stainless steel (Type 304) connections.  Food grade reservoir means the tank works great with potable (drinking) water.
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Water Safety & Flow Control Support - Helpful Tools and Resources The extra volume created by this expansion has to go somewhere or pressure will dramatically increase, such as when water is heated in a closed system. A good indication of thermal expansion is when the T&P valve releases about one cup of water for each 10 gallons of heater capacity with each heating cycle.
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Does air expand when heated? Answers. Relevance. Rating Newest Oldest. Best Answer: Yes, air does expand when it is heated because of the fact that the molecules in the air start vibrating and moving around more faster and the distance between the molecules increases so as a result the air expands.nswers. Relevance. Rating Newest Oldest. Best Answer: Yes, air does expand when it is heated because of the fact that the molecules in the air start vibrating and moving around more faster and the distance between the molecules increases so as a result the air expands.
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- a water filled balloon in the chamber and to their surprise, nothing happens. Water does not have the same expansion properties of a gas and the skin of the balloon exerts enough pressure
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Thermal expansion The volumetric thermal expansion coefficient is the most basic thermal expansion coefficient, and the most relevant for fluids. In general, substances expand or contract when their temperature changes, with expansion or contraction occurring in all directions. Substances that expand at the same rate in every direction are called isotropic.
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- Thermal expansion of heated water may occur wherever water is heated in a closed system (when the boiler water is isolated from the public water supply by a one-way valve, such as a feed water pressure reducing valve, backflow preventer, check valve, etc.).
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Volumetric - or Cubic Thermal Expansion Example - water is a liquid where the volumetric expansion coefficient changes a lot with temperature. Water has its highest density and smallest volume at 4oC (39.2 oF). The volumetric coefficient for water is negative below 4oC and indicates that the a volume decreases when temperature moves from 0oC (32 oF) to 4oC.
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Books & Resources I’ll begin with an incorrect explanation for why air (or any other gas, for that matter) expands when you heat it. The reason I’m doing this is that the following wrong explanation can be found in many science resources. Hot air molecules, on average, have more space between them than cool air molecules. Therefore, when you heat air it expands to allow more space for the molecules. If you then cool the air, it contracts because cool air molecules need less space than hot air molecules. To see why this is an incorrect explanation, imagine a bunch of gas molecules bouncing around inside a rigid container.
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- A: There is a real explanation; basically it's because water cools as it boils. So, heating a pot of water to keep it boiling increases its temperature but the act of boiling decreases the water temperature. The temperature increase and decrease essentially balance, thus keeping the temperature more or less constant.
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- That's what the tiny bubbles are, that's what the little bubbles are and that's what the big bubbles are. The temperature gradient in the water isn't that much. Remember as water heats up it expands and rises, pushing the cooler water down to be heated, so the water is circulating and so is the heat.
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- When you boiled ionized alkaline water until it reaches the boiling point, the water molecules nearer to heat source will expand greatly until it transform into vapor gas, that is why you can see bubbles rising from the bottom.
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THERMAL EXPANSION THERMAL EXPANSION. CONCEPT. Most materials are subject to thermal expansion: a tendency to expand when heated, and to contract when cooled. For this reason, bridges are built with metal expansion joints, so that they can expand and contract without causing faults in the overall structure of the bridge.
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Liquid Nitrogen, Gas Laws and Rocket Science Assuming that you have an air space: If you have cold water in a sealed bottle that you heat up, it will expand. If you put hot water in a bottle and seal it, it will contract as it cools. If the bottle is not sealed, there will be no volume change. 2 people found this useful.
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Why expansion tank is needed That is an expansion tank installed on the water supply pipe to the water heater. Its purpose is to deal with thermal expansion of water as it heats up in the water heater - to prevent water pressure from getting too high. If water pressure gets high enough it can damage valves in plumbing fixtures, joints in supply pipes and even the water heater.
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- It’s a pretty simple device. The metal coil expands as the temperature increases. This expansion in the coil means that the glass tube at the top will be tilted at a different angle. Inside the tube are two wires (one at each end) and some mercury.t higher energy levels, the average atom separation is also larger. When you increase the temperature for most objects, they expand. Of course, this assumes that the more complicated ball and spring model works for solids as well as for molecular hydrogen, but it mostly does.
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- In response to this warming, global mean sea level will change in part due to thermal expansion of the oceans. In this activity, global warming is not being shown, rather thermal expansion of water is used as a valid and simple activity to demonstrate that an increase in temperature can cause sea level rise.
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Boiling liquid expanding vapor explosion 1 As the liquid changes to a gas it expands-this expansion in a vented container would cause the gas and liquid to take up more space. 2  In a sealed container the gas and liquid are not able to take up more space and so the pressure rises.
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Breath Sounds Your doctor will use a medical instrument called a stethoscope to listen for normal breath sounds. A normal breath sound is similar to the sound of air. Your doctor can hear normal breath sounds by placing the stethoscope on your: chest; back; collarbone; rib cage; Your doctor can also use a stethoscope to hear abnormal breathing sounds, which may include: rhonchi, which are low-pitched sounds; crackles, which are high-pitched sounds
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- The Expansion of Water Upon Freezing. The fact that water expands upon freezing causes icebergs to float. The fact that water reaches a maximum density at about 4°C causes bodies of water to freeze on the top first. Then the further expansion as a part of the phase change keeps the ice floating with some 8% of its mass above the surface.
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Why does the volume of water increase on freezing? The volume of water increases both when freezing and heating. This is due to molecular expansion and has a factor of. 0.00036cc per degree F. Also water is at its minimum at +4 degrees C. Anything above or below this tempearure water will expand.
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Temperature Effects on Density This makes sense because, as heat is added to the liquid water, there is greater kinetic energy of the molecules and there are also more vibrations of the water molecules. Together these mean that each H 2 O unit in liquid water takes up more space as the temperature increases.his makes sense because, as heat is added to the liquid water, there is greater kinetic energy of the molecules and there are also more vibrations of the water molecules. Together these mean that each H 2 O unit in liquid water takes up more space as the temperature increases.