Reynolds number, NRe, is a dimensionless number that relates inertial and viscous forces. It is used in the friction factor correlation, to determine the resistance to flow by a pipe. 👍👍👍More Chemical Engineering👍👍👍

 Physical adsorption: Van der Waals attraction between adsorbate and
adsorbent.
 The attraction is not fixed to a specific site and the adsorbate is
relatively free to move on the surface.
 This is relatively weak, reversible,
adsorption capable of multilayer adsorption.
 Chemical adsorption: Some degree of chemical bonding between adsorbate and
adsorbent characterized by strong attractiveness.
 Adsorbed molecules are not free to move on the surface.
 There is a high degree of specificity and typically a monolayer is formed. 👍👍👍More Chemical Engineering👍👍👍

Fluid is a substance that deforms continuously under the application of sheer stress.
Fluid at rest cannot resist sheer stress, but it have normal sheer stress. And fluid in motion can have both sheer stress and normal stress.
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 😳😳Law of Thermodynamics😳😳 Zeroth law of thermodynamics: Dealing with thermal equilibrium.
 First law of thermodynamics : deals with conservation energy & applies to the system and surrounding.
 Second law of thermodynamics: Energy has quality as well as quantity and actual processes occur in the direction decreasing quality of energy.
 Third law of thermodynamics: Entropy of a pure substance approaches zero as the absolute temperature reaches zero. 👍👍👍More Chemical Engineering👍👍👍

 System: Quantity of matter or a region in space chosen for study.
Surrounding: The mass or region outside the system.
Boundary: The real or imaginary surface that separates the system and surrounding.
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 Steady: No change in time.
 Uniform: No change with location 👍👍👍More Chemical Engineering👍👍👍

 Compressed liquid (Subcooled liquid): A substance that it is not about to vaporize.
 Saturated liquid: A liquid that is about to vaporize.
 Saturated vapor: A vapor that is about to condense.
 Saturated liquid – vapor mixture: The state at which the liquid and vapor phases coexist in equilibrium.
 Superheated vapor: A vapor that is not about to condense.
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 Process: any change from one equilibrium state to another.
 Path: Series of change states through which system passes through.
 Cycle: a process during which the initial and final states are identical.
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 Entropy: Disorder of molecules within the system.
 Enthalpy: is the summation of internal energy and work.
 Helmholtz free energy: is the process proceeds towards equilibrium it can be maximum work on the surrounding.
 Gibbs free energy: Donets net available energy.
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 Equilibrium: is the absence of any tendency towards a change.
 Thermal equilibrium: If the two bodies are different temperature are brought in contact with each other, after some time both bodies will attain the same temperature.
 Mechanical equilibrium: No change in pressure at any point in the system with time (pressure can change with the system with elevation).
 Chemical equilibrium: If chemical composition of a system does not change with time. That is, no chemical reaction occur.
 Phase equilibrium: If the system involves two phases and when the mass of each phase reaches an equilibrium leave and stays there.
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 Critical point: The point at which the saturated liquid and saturated vapor states identical.
 Triple point: pressure and temperature, a substance exists in three phase in equilibrium.
 Specific heat: The energy required to raise the temperature of a unit mass of a substance by one degree.
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