What is viscosity how it change with change in temperature?
Answer: In general, the viscosity of a simple liquid decreases with increasing temperature. As temperature increases, the average speed of the molecules in a liquid increases and the amount of time they spend “in contact” with their nearest neighbors decreases.
How does viscosity vary with temperature class 11?
Coefficient of viscosity of a liquid decreases while that of a gas increase, with increasing temperature.
What is viscosity and how is it determined?
Viscosity is the measure of a substance’s resistance to motion under an applied force. The formula for measuring viscosity is fairly simple: viscosity = shear stress / shear rate. The result is typically expressed in centipoise (cP), which is the equivalent of 1 mPa s (millipascal second).
How does viscosity vary?
In general, the viscosity of a simple liquid decreases with increasing temperature. As temperature increases, the average speed of the molecules in a liquid increases and the amount of time they spend “in contact” with their nearest neighbors decreases.
How does viscosity of a liquid change with temperature?
When a liquid is heated, the kinetic energy of its molecules increases and the intermolecular attraction becomes weaker. Hence, the viscosity of a liquid decreases with increase in its temperature.
How does viscosity change with temperature and pressure?
Pressure has an effect on both, the viscosity of liquid as well as gases. On increasing pressure viscosity of liquid molecules increases due to the increase in the resistance to the flow of liquid. The viscosity of gases increases as temperature increases and is around comparative to the square root of temperature.
Is viscosity related to temperature?
Viscosity depends strongly on temperature. In liquids it usually decreases with increasing temperature, whereas, in most gases, viscosity increases with increasing temperature.
What is viscosity of gas?
The viscosity of a gas can be thought of as a measure of its resistance to flow and is measured in the CGS unit Poise = dyne sec/cm2. The viscosity of gases near room temperature are in the centiPoise range, so that is a commonly used unit. Gas viscosity is only weakly dependent on pressure near atmospheric pressure.
Why does viscosity decrease as temperature increases?
The increase in temperature causes the kinetic or thermal energy to increase and the molecules become more mobile. The attractive binding energy is reduced and therefore the viscosity is reduced.
How do you find the viscosity of temperature?
Simply multiply the kinematic viscosity of the liquid at a particular temperature by its density at that same temperature. For example, the kinematic viscosity and density of water at 78 °C is around 0.37344 mm2 per second and 0.973 grams per cm3, respectively.
Does viscosity depend on temperature?
What is the relation between temperature and viscosity?
The gas viscosity will increase with temperature. According to the kinetic theory of gases, viscosity should be proportional to the square root of the absolute temperature, in practice, it increases more rapidly.