Density of Water: Is It the Same Everywhere?

In summary, the conversation discusses the possibility of density being the same throughout a disk of water, except for a section where there is gas. The first case considers a disk on Earth with perfect gravity, while the second case involves a disk in space with a fixed external system. It is noted that due to gravitation and compressibility, it is highly unlikely for density to be exactly the same in both cases, with the precision being at 1e-3000 if necessary. Therefore, the answer is "no".
  • #1
Gh778
421
0
I would like to know if density is exactly the same everywhere in a disk full of water except at one part where there is gas. All are fixed: disk of water, and container of gas. I don't want the value of density just to know if density is exactly the same everywhere in disk of water. 2 cases:

a/ disk is put on Earth, gravity is perpendiculary to the screen, diameter of disk is 10 km (theoretical study and I suppose gravity from Earth perfect)

b/ disk is in space, it's size is 10000 km of diameter (all is fixed by external theoretical system)
 

Attachments

  • w+g.jpg
    w+g.jpg
    8.1 KB · Views: 398
Last edited:
Physics news on Phys.org
  • #2
Gravitation & compressibility make it quite unlikely, although it depends how exact is your "exactly", as water compressibility is quite low.
 
  • #3
exactly is exactly the same value, precision at 1e-3000 if necessary
 
Last edited:
  • #4
Then the answer is "no".
 
  • Like
Likes 1 person
  • #5


I can confidently say that the density of water is not exactly the same everywhere in a disk full of water, even in the two cases presented. This is due to several factors such as temperature, pressure, and the presence of impurities.

In case a, where the disk is on Earth, the density of water will vary depending on the depth of the disk. This is because the pressure exerted by the water column increases with depth, causing the density to increase as well. Additionally, the temperature of the water may also vary, which can further affect the density.

In case b, where the disk is in space, the density of water may be more uniform compared to case a. However, it is still not exactly the same everywhere as there may be variations in temperature and pressure within the disk. Additionally, the presence of impurities or dissolved gases can also affect the density of the water.

Therefore, it is not accurate to say that the density of water is the same everywhere in a disk, even under controlled conditions. The only way to achieve a completely uniform density would be to have a perfectly homogeneous and pure sample of water, which is practically impossible to achieve.
 

1. What is density of water?

Density of water refers to the mass per unit volume of water. It is commonly measured in grams per cubic centimeter (g/cm3) or kilograms per cubic meter (kg/m3). Essentially, it is a measure of how compact or concentrated water molecules are in a given volume.

2. Is the density of water the same everywhere?

No, the density of water can vary depending on factors such as temperature, pressure, and salinity. At standard temperature and pressure (STP), the density of pure water is 1 g/cm3, but it can change slightly with changes in these variables.

3. How does temperature affect the density of water?

As temperature increases, the density of water decreases. This is because as water molecules absorb heat energy, they become more active and spread out, resulting in a lower density. This is why ice (frozen water) is less dense than liquid water, as the molecules are more organized and tightly packed in a solid state.

4. Does salinity affect the density of water?

Yes, salinity (the amount of dissolved salt in water) can affect the density of water. Water with a higher salinity will have a higher density compared to pure water at the same temperature and pressure. This is because the dissolved salt ions take up space, making the water more compact and increasing its density.

5. How is the density of water important in various industries?

The density of water is important in a variety of industries, including shipping, energy production, and agriculture. In shipping, the density of water is used to determine the carrying capacity of ships. In energy production, it is important for understanding water circulation and heat transfer in power plants. In agriculture, the density of water is crucial for determining the water requirements of crops and irrigation systems.

Similar threads

Replies
17
Views
2K
  • Mechanics
Replies
2
Views
3K
  • Thermodynamics
Replies
5
Views
765
Replies
25
Views
2K
Replies
8
Views
3K
  • Classical Physics
Replies
2
Views
1K
  • Classical Physics
Replies
1
Views
636
  • Introductory Physics Homework Help
Replies
13
Views
2K
Back
Top