Viscosity and pressure relation

AI Thread Summary
The relationship between viscosity and pressure indicates that, generally, the viscosity of liquids increases with pressure, while gases remain largely unaffected. However, water is an exception, as its viscosity decreases under increased pressure. This phenomenon is attributed to the cohesive forces within liquids; as pressure rises, these forces can enhance flow in most liquids but not in water. The discussion highlights the distinction between chemical and physical principles in understanding viscosity behavior. Understanding these dynamics is crucial for applications in fluid mechanics and material science.
Hardik Batra
Messages
130
Reaction score
5
i know the relation between these two.

with increase in pressure, the viscosity of liquids (expect water] increases while that of gases is practically independent of pressure.

The viscosity of water decreases with increase in pressure.

i want to know the reason behind this.
 
Physics news on Phys.org
Hardik Batra said:
i know the relation between these two.

with increase in pressure, the viscosity of liquids (expect water] increases while that of gases is practically independent of pressure.

The viscosity of water decreases with increase in pressure.

i want to know the reason behind this.


it is a bit of chemistry not physiics as the pressure increases the cohessive forces increases which in turn decreases the viscosity of liquuid as
cohesive force doesn't slow water to flow easily among its own.
 
Not everything is same iin chem and phy some differences are also there..
 

Thread 'Is calling fictitious forces "not real" just about terminology?'

Hi there, im studying nanoscience at the university in Basel. Today I looked at the topic of intertial and non-inertial reference frames and the existence of fictitious forces. I understand that you call forces real in physics if they appear in interplay. Meaning that a force is real when there is the "actio" partner to the "reactio" partner. If this condition is not satisfied the force is not real. I also understand that if you specifically look at non-inertial reference frames you can...
View full post »

Thread 'Derivation of Hamilton's Principle: Questions'

I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...
View full post »

Similar threads

Can turbulence help measure liquid viscosity more accurately?
Replies
8
Views
2K
Parabolic Pressure Distribution in a Jet
Replies
8
Views
2K
Rocket propulsion explained only through pressure differential
Replies
46
Views
5K
Optimal Size of Rocket Engine Nozzle for Vacuum Performance
Replies
26
Views
3K
How Does Viscosity Influence Pressure Drag in 2D Airflow?
Replies
4
Views
3K
I Sound pressure and inverse distance law
Replies
5
Views
2K
How Does Pressure Affect the Boiling Point of Water?
Replies
2
Views
7K
Intuition problem about an accelerating barometer
Replies
33
Views
2K
How pressure affects partial pressures (and dewpoint)
Replies
10
Views
2K
Viscosity by Falling Sphere Equations
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top