HOT WATER TAKES UP MORE SPACE THAN COLD WATER TRUE OR FALSE
HEAT CAN CHANGE THE DENSITY OF A LIQUID TRUE OR FLASE
OIL AND WATER WILL MIX IF HEATED TRUE OR FALSE
ALL LIQUIDS WILL MIX TOGETHER, CREATING A MIXTURE WITH A COMMON DENSITY TRUE OR FALSE
SCIENCE QUESTION
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vick_panwar
- Former Expert
- Posts: 5
- Joined: Tue Sep 26, 2006 7:12 pm
This is an interesting question.
The following law of ideal gases is applicable in a crude way to all substances.
P * V ~ T
The product of pressure and volume is (directly) proportional to the temperature.
So to answer you questions.
1. Water will have a larger volume if the pressure remains (more of less) the same. So yes, under normal contitions hot water takes more space than cold.
2. Density is defined as M/V - mass divided by volume. Since heat doesn't change the mass but it changes the volume as we have seen above, the density would change too. I'll leave it to you to find out how the ratio changes with respect to the Temperature.
3. This is a complicated question. We need to understand what is meant by "mixtures" - There are various kinds. Homogeneous and heterogeneous. Milk is a good example of a homogeneous mixture. You can think of milk as a mixture of fat and water. oils are a kind of fat which are hydrophobic (water repelling) by nature. So they don't mix well with water. Heat gives the milecules a higher kinetic energy and they appear to get along better.
The following law of ideal gases is applicable in a crude way to all substances.
P * V ~ T
The product of pressure and volume is (directly) proportional to the temperature.
So to answer you questions.
1. Water will have a larger volume if the pressure remains (more of less) the same. So yes, under normal contitions hot water takes more space than cold.
2. Density is defined as M/V - mass divided by volume. Since heat doesn't change the mass but it changes the volume as we have seen above, the density would change too. I'll leave it to you to find out how the ratio changes with respect to the Temperature.
3. This is a complicated question. We need to understand what is meant by "mixtures" - There are various kinds. Homogeneous and heterogeneous. Milk is a good example of a homogeneous mixture. You can think of milk as a mixture of fat and water. oils are a kind of fat which are hydrophobic (water repelling) by nature. So they don't mix well with water. Heat gives the milecules a higher kinetic energy and they appear to get along better.
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paulsdecarli
- Former Expert
- Posts: 67
- Joined: Sat Sep 03, 2005 10:20 am
Some answers
Most materials expand as the temperature increases. There are exceptions, one of which is water very near the freezing point. Water is at it's densest at ~4 degrees C. Water actually contracts as it is heated from ) degrees C to 4 degrees C at one atmosphere pressure.
Some liquids will mix above a certain temperature and separate below that temperature.
Some liquids do not mix at any temperature. A lot of oils do not mix with water, but I wouldn't want to say that all oils do not mix with water. Oils can form an emulsion with water, but an emulsionnis not a true solution. Look up "emulsion" and "solution".
Some liquids will mix above a certain temperature and separate below that temperature.
Some liquids do not mix at any temperature. A lot of oils do not mix with water, but I wouldn't want to say that all oils do not mix with water. Oils can form an emulsion with water, but an emulsionnis not a true solution. Look up "emulsion" and "solution".