Introductory Fluid Mechanics L4 p1 - What is pressure?

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  1. Ron Hugo
  2. Fluid Mechanics (Field Of Study)
  3. Pressure (Dimension)
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02:58 weight = mass * g = density * volume * g = density * (0.5 * delta_x * delta_z * b) * g

pinghsiuhsieh
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Why is weight added instead of being subtracted? Since it is in the opposite direction of Pz, shouldn't it be subtracted?

SophiaRyoo
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I think that the sin(theta) and cos(theta) should not have been omitted in the last two equations for pressure in the x direction and pressure in the z direction, although the cos term will divide out since the sum of forces in the x direction equals zero and the sin term will divide out in a similar fashion when delta z becomes infinitesimally small. Am I correct by saying this? Is this just a simplification that was understood?

JohnHondo