As water is cooled from 4 degrees Celsius to 0 degrees Celsius what is the density?
the density of water is mostly high when its at 4 degrees celsius so the answer would be that the density of the water decreases from 4 degrees celsius to 0 degrees celcius
Its density decreases i.e., it expands. Water has maximum density at 4 degrees celsius. On further increasing the temperature or decreasing the temperature its density decreases. On heating due to thermal energy molecules vibrate more so volume increases and density decreases. On cooling density decrease is due change in arrangement of molecules with respect to each other. Molecules form hexagonal arrangement which takes more volume .
Why does all the water in a lake have to be cooled to 4 degrees Celsius before water can be cooled below 4 degrees Celsius?
Water in a lake is usually cooled by the cold air above its surface rather than from the ground underneath it. As the top layer of water cools its density increases and so it sinks to the bottom, bringing other water up to the surface. This water is then cooled. This carries on until the temperature reaches 4 deg C when the density reaches a maximum. Further cooling lowers the temperature of the top layer…
Water is most dense at 4 degrees C, after which the molecules will begin to arrange themselves in the open hexagonal structure. This will result in an increase in volume. Also, because the density is decreasing, using the formula for density: D = m/V Solving for V: V = m/D Because the mass remains constant, and the denominator, density, is decreasing, the volume will be larger.
Density rho = mass / Volume. Water has a density of 1,000 kg/m3 = 1,000 g/L = 1.000 kg/dm3 = 1.000 kg/L = 1.000 g/cm3 = 1.000 g/mL at the temperatur of 3.98 degrees Celsius. Temperature in degrees Celsius and the density of water: 1 ................. 999,90 2 ................. 999,94 3 ................. 999,96 4 ................. 999,97 5 ................. 999,96 6 ................. 999,94 7 ................. 999,90 You see the highest density is only at 4 degrees…
Water at -20 degrees Celsius; heat will expand matter, so at +40 degrees Celsius, water would have less density. * * * * * That would be true if there were no phase change. Unfortunately for the above answer, water freezes at 0 deg C and that phase change is accompanied by an expansion. As a result, water at 40 deg C is denser that water (ice) at -20 deg C.
Water has curious thermal properties. It contracts (gets denser) as it cools down just like other materials. However, at 4 degrees Celsius, it reaches the maximum density of 1 and then starts expanding if it is further cooled. Ice formed at zero degree Celsius is actually less dense than water and floats on it.