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Related Concept Videos

Hydrostatic Pressure Force on a Curved Surface01:04

Hydrostatic Pressure Force on a Curved Surface

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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Hydrostatic Pressure Force on a Plane Surface01:04

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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
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Applications of Integration to Find Hydrostatic Pressure01:30

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Hydrostatic force is a fluid's total force at rest on a surface. For a horizontal surface submerged at a fixed depth, the pressure is constant and calculated as the product of fluid density, gravitational acceleration, and depth. In the case of a vertical dam wall submerged in water, this force is not evenly distributed due to the increasing pressure with depth. This variation arises from the cumulative weight of the water above each point. Integration is used to account for the continuous...
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Flow Table Test01:12

Flow Table Test

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The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
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Testing Water Quality01:14

Testing Water Quality

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When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
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Related Experiment Video

Updated: Mar 9, 2026

In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure
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The Virtual Hydrostatic Test.

Edward L Mazuchowski1, Dori M Franco, Philip J Berran

  • 1From the Armed Forces Medical Examiner System, Dover AFB, DE.

The American Journal of Forensic Medicine and Pathology
|December 23, 2016
PubMed
Summary
This summary is machine-generated.

Postmortem computed tomography (CT) can help determine live birth by detecting air in the lungs and body. This noninvasive imaging technique offers advantages over traditional methods for assessing neonatal death cases.

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Area of Science:

  • Forensic Pathology
  • Medical Imaging
  • Neonatal Medicine

Background:

  • The hydrostatic test is a traditional method for determining live birth, but it has limitations.
  • Computed tomography (CT) provides noninvasive visualization of air and gas within the body.

Observation:

  • Four cases of neonatal death (20-25 weeks gestation) were analyzed using hydrostatic testing, radiography, and CT prior to autopsy.
  • CT accurately detected air in the lungs and trachea, and gas in the liver and soft tissues.
  • Correlation between hydrostatic test results (lung/liver buoyancy) and CT findings was assessed.

Findings:

  • In cases of stillbirth, lungs and liver sank, with no air detected in lungs on CT.
  • In a confirmed live birth, lungs floated, liver sank, and CT showed air in the respiratory tract and lungs.
  • In a case of decomposition, both lungs and liver floated, with gas in soft tissues, precluding determination of birth status.

Implications:

  • Postmortem CT is a valuable, noninvasive tool for assessing live birth in neonatal death investigations.
  • CT offers advantages over radiography, providing detailed visualization of air distribution.
  • Further research correlating CT with existing methods is warranted to refine its application in forensic pathology.