Eparchaean Unconformity (Tirupati hills), a notified National Geo-heritage Monument is a major discontinuity of stratigraphic significance that represents a period of remarkable serenity in the geological history of the earth i.e. sudden changes and discontinuity in the rock layers in earth;s crust.
 It is seen at the steep natural slopes, road scars and ravines in the Tirupati – Tirumala Ghat road in Chittoor district of Andhra Pradesh, India.
In hydraulic engineering, air bubble entrainment is defined as the entrapment of air bubbles and pockets that are advected within the turbulent flow.
 The entrainment of air packets can be localised or continuous along the air–water interface.
 Examples of localised aeration include air entrainment by plunging water jet and at hydraulic jump.
 Bubbles are entrained locally at the intersection of the impinging jet with the surrounding waters.
 The intersecting perimeter is a singularity in terms of both air entrainment and momentum exchange, and the air is entrapped at the discontinuity between the impinging jet flow and the receiving pool of water.
 Interfacial aeration is defined as the air entrainment process along an air–water interface, usually parallel to the flow direction.
The illusory continuity of tones is the auditory illusion caused when a tone is interrupted for a short time (approximately 50ms or less), during which a narrow band of noise is played.
 The noise does, however, have to be of a sufficiently high level to effectively mask the gap.
 Whether the tone is of constant, rising or decreasing pitch, the ear perceives the tone as continuous if the 50ms (or less) discontinuity is masked by noise.
 Because the human ear is very sensitive to sudden changes, however, it is necessary for the success of the illusion that the amplitude of the tone in the region of the discontinuity not decrease or increase too abruptly.
"Shock" is an abrupt discontinuity in the flow field.
 It occurs in flows when the local flow speed exceeds the local sound speed.
 More specifically, it is a flow whose Mach number exceeds 1.
In fluid mechanics, flows in closed conduits are usually encountered in places such as drains and sewers where the liquid flows continuously in the closed channel and the channel is filled only up to a certain depth.Typical examples of such flows are flow in circular and Δ shaped channels.Closed conduits flow differ from open channel flow only in the fact that in closed channel flow there is a closing top width while open channels have one side exposed to its immediate surroundings.Closed channel flows are generally governed by the principles of channel flow as the liquid flowing possesses free surface inside the conduit.
 However, the convergence of the boundary to the top imparts some special characteristics to the flow like closed channel flows have a finite depth at which maximum discharge occurs.
 For computational purposes, flow is taken as uniform flow .
Manning's Equation, Continuity Equation (Q=AV) and channel's cross-section geometrical relations are used for the mathematical calculation of such closed channel flows.
Paul-Michel Foucault (15 October 1926 – 25 June 1984), generally known as Michel Foucault (] ), was a French philosopher, historian of ideas, social theorist, and literary critic.
A vortex sheet is a term used in fluid mechanics for a surface across which there is a discontinuity in fluid velocity, such as in slippage of one layer of fluid over another.
 While the tangential components of the flow velocity are discontinuous across the vortex sheet, the normal component of the flow velocity is continuous.
 The discontinuity in the tangential velocity means that the flow has infinite vorticity on a vortex sheet.
In gas dynamics, the Kantrowitz limit refers to a theoretical concept describing choked flow at supersonic or near-supersonic velocities.
 When a fluid flow experiences a reduction in area, the flow speeds up in order to maintain the same mass-flow rate, per the continuity equation.
 If a near supersonic flow experiences an area contraction, the velocity of the flow will increase until it reaches the local speed of sound, and the flow will be choked.
 This is the principle behind the Kantrowitz limit: it is the maximum amount of contraction a flow can experience before the flow chokes, and the flow rate can no longer be increased above this limit, independent of changes in upstream or downstream pressure.
For Michel Foucault (1926–84), discontinuity and continuity reflect the flow of history and the fact that some "things are no longer perceived, described, expressed, characterised, classified, and known in the same way" from one era to the next.
 (1994).
In the history of ideas, the continuity thesis is the hypothesis that there was no radical discontinuity between the intellectual development of the Middle Ages and the developments in the Renaissance and early modern period.
 Thus the idea of an intellectual or scientific revolution following the Renaissance is, according to the continuity thesis, a myth.
 Some continuity theorists point to earlier intellectual revolutions occurring in the Middle Ages, usually referring to the European "Renaissance of the 12th century" as a sign of continuity.
 Despite the many points that have been brought up by proponents of the continuity thesis, a majority of scholars still support the traditional view of the Scientific Revolution occurring in the 16th and 17th centuries.

Question: Which citizen was man who believes discontinuity and continuity reflect the flow of history?
Answer: French