2007-09-28 04:04:10 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Sorry, my question was badly asked - from someone that is rubbish at science. The reason I ask is because when I fill my babies bottles up to 4oz it is always under once it has cooled down. My partner thinks that I can't fill the bottles correctly. I knew there was a scientific reason why I couldn't make them meet the line. And now I can explain that to him!! Thanks :0) xox
2007-09-28 04:39:00 · update #1
no. not if they weight the same.
2007-09-28 04:06:36 · answer #1 · answered by Girlie 3 · 0⤊ 1⤋
The mass is the same but, at higher temp. the water has a larger volume due to expansion. As it cools, it contracts in volume showing a slightly lower level in the bottle.
Another cause is that, at higher temp, the water is evaporating more (water vapour is leaving the bottle..unless it's closed). If it's open to atmosphere while cooling, the loss of this vapour will also reduce volume, AND the mass.
(With regard to maximum density. Pure water is at its maximum density at 4°C.(39.2°F). When heated above or cooled below this temp., the water will expand and continues to expand as it changes to steam and as it freezes and as it cools further to below freezing).
2007-09-28 23:50:58 · answer #2 · answered by Norrie 7 · 0⤊ 0⤋
Mass refers to the number of molecules or atoms present, and is therefore unaffected by temperature in a closed system.
In the hot water the molecules take up more space because they are moving more energetically.
P = VT basically (and only roughly) describes the relationship between pressure, volume and temperature.
2007-09-28 11:17:42 · answer #3 · answered by Anonymous · 0⤊ 0⤋
NO!!!!
However, Hot water is less dense than cold water. This because the molecules in hot water have more kinetic energy and move about faster requiring more space. Hence hot water becomes less dense.
It is interesting to note that water is at its most dense at 36 degrees F ( 2 degrees C) . Not at its freezing point. The reasons behind this are very complex, but hydrogen bonding is one of the factors involved.
2007-09-28 11:24:46 · answer #4 · answered by lenpol7 7 · 0⤊ 1⤋
yes hot water expands which gives you pressure in a central heating system but a 3oz bottle to a baby with stomach the size of a ping pong ball stop worrying
2007-09-28 17:04:59 · answer #5 · answered by NEIL K 2 · 0⤊ 0⤋
no. the masses are the same, its just that the particles in a hot liquid are further apart because they are vibrating more due to increased kinetic energy from the heat source
2007-09-28 11:15:51 · answer #6 · answered by Anonymous · 0⤊ 0⤋
not necessarily - water is an exception to the rules and it expands between 0 and 4 degrees - if it didn't life could not be sustained.
2007-09-28 11:07:52 · answer #7 · answered by dave w 5 · 0⤊ 0⤋
Surely it expands in volume as temperature rises but it expands even more when it freezes, am I confusing mass and density??
2007-09-28 11:12:53 · answer #8 · answered by It's me :) 6 · 0⤊ 0⤋
no. it is still water, the mass is the same. density is different because of different volume, hot water has larger volume and lower density.
2007-09-28 11:06:37 · answer #9 · answered by Carborane 6 · 2⤊ 1⤋
it depends o nhow much water you have because you cant figure anything out unlessyou know how much water there is in ml or whatever!
2007-09-28 11:09:04 · answer #10 · answered by Anonymous · 0⤊ 1⤋