Question 3: Explain pressure. ( it is advised to look at thesupplied materials and explain from them)

Supplied Materials:

-For static fluids, consider the force balance. Fluidstatics.
is there. In the case of liquids, the change in pressure due toheight is large, and it must be handled. Also, even when thecontainer is in a relatively stationary state, for example, whenthe container is operating at high speed, it is possible to thinkof the motion of the fluid in the target system fixed to thecontainer as if it were the stationary fluid.
  

3.1 Pressure p.22~

p expressed as p=P/A is called Pressure and P is called totalpressure. When the pressure is not uniform, the pressure at onepoint is p=lim ΔA→0 (ΔP/ΔA)=dP/dA
Is displayed.

3.1.1 Unit of pressure p.22~
・In SI unit, the unit of pressure is often expressed as Pascal (Pa)or Bar (bar) or Water column meter (mH2O, mAq). Refer to Table 3.1on page 23 of the textbook for pressure unit conversion. Of these,remember the following three in particular. 1Pa=1N/m2
1atm=101325Pa
1mHg=1/0.76atm
Pa is the basic unit of pressure, atm is 1 atm, and 1 mHg is usedfor conversion when measuring mercury column.

3.1.2 Absolute pressure and gauge pressure p.23~
・There are the following two methods to express the pressure. Becareful not to be confused.
(See Figure 3.1 in textbook p.23.) Absolute pressure: A methodbased on perfect vacuum. Gauge pressure: A method based onatmospheric pressure. (Gauge pressure) = (Absolutepressure)-(Atmospheric pressure) In other words, the gauge pressureindicates whether or not there is a pressure difference fromatmospheric pressure. Therefore, the pressure measuring instrumentusually shows gauge pressure, so it is necessary to consider theatmospheric pressure.

3.1.3 Properties of pressure p.23~
・Pressure has the following three properties. (1) The pressure ofthe fluid always acts vertically on the wall surface in contactwith the fluid. (2) The pressure at one point in the stationaryfluid is the same in both directions. (3) The pressure applied tothe fluid in the closed container is transmitted to all parts withthe same strength. Pascal principle: F2/A2 = F1/A1
∴ F2 = F1 × (A2/A1)

End of supplied materials. Thank you so much, and I hope you areable to deliver this. The explaination shouldnt be short but nottoo long either is thats not a bother