When mercury is filled in glass tube then what is the value of angle of contact?

then the angle of contact between mercury and glass is more than 90∘, i.e., obtuse angle. In case of a water in glass capillary tube, the force of cohesion between wate molecules in less than the force of adhesion between water molecules and glass modecules.

For which of the two pairs the angle of contact is same?

Both liquids water and alcohol have same nature (ie, wet the solid). Hence, angle of contact for both is acute.

What is the contact angle of water on glass?

As the hydrophobicity increases, the contact angle of the droplets with the surface increases. Surfaces with contact angles greater than 90° are designated as hydrophobic. The theoretical maximum contact angle for water on a smooth surface is 120°….Contact Angle of Water on Smooth Surfaces and Wettability.

No.	Name	Contact angle θ
32	soda-lime glass	<15°
33	gold, clean	<10°

What is angle of contact when it is obtuse?

When the liquid surface is curved concave upwards, the angle of contact is acute and when the liquid surface is curved convex upwards, the angle of contact is obtuse.

What is SI unit of surface energy?

The SI composite unit of surface energy density is the joule per square meter.

What is the formula of surface energy?

Surface energy = Energy × [Area]-1. Or, E = [M1 L2 T-2] × [M0 L2 T0]-1 = [M1 L0 T-2]. Therefore, the surface energy is dimensionally represented as [M1 L0 T-2].

How do you convert flow to power?

The power gained by fluid from an operating pump or fan

Power Gained by Fluid. The power gained by the fluid from a pump or fan can be expressed as: P = m w (1) where. P = power (W)
Specific Work. Specific work – w – can be expressed: w = g h (2) where.
Mass Flow Rate. Mass flow rate – m – can be expressed: m = ρ Q (3) where.

How do you calculate RPM flow?

Determine the pump flow rate, head, and power requirements if the pump speed is increased to 3600 rpm. It is possible to develop the characteristic curve for the new speed of a pump based on the curve for its original speed….Pump Laws.

n	=	speed of pump impeller (rpm)
P	=	pump power (kW)