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Videos de Conceptos Relacionados

Buoyancy and Stability for Submerged and Floating Bodies01:11

Buoyancy and Stability for Submerged and Floating Bodies

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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Buoyancy01:12

Buoyancy

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When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
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Density and Archimedes' Principle01:05

Density and Archimedes' Principle

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When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The...
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Archimedes' Principle01:13

Archimedes' Principle

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Archimedes' principle states that an upward buoyant force exerted on a body that is immersed partially or entirely in a fluid is equal to the weight of the fluid displaced by it. To understand how much buoyant force is needed to make an object float, let us think about what happens when a submerged object is removed from a fluid. If the object were not in the fluid, the space occupied by the object would be filled by the fluid having a weight wfl. This weight is supported by the...
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Weightlessness01:01

Weightlessness

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When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
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Design Example: Application of Archimedes' Principle01:11

Design Example: Application of Archimedes' Principle

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Archimedes' principle is fundamental in analyzing the buoyant force and stability of floating bodies. In this example, a wooden block with a rectangular section floats in seawater. Based on the block's dimensions, its specific gravity and the specific weight of seawater are used to find the volume of water displaced and the center of buoyancy.
The volume of seawater displaced by the block is determined by first calculating the block's weight. This is done by multiplying the...
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Video Experimental Relacionado

Updated: Jan 14, 2026

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology
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Flotabilidad Neutra como un Enfoque Sencillo para la Microgravedad Simulada

Ho Yong Kim1, Sungwook Kang2, Se Heang Oh3,4

  • 1Department of Nanobiomedical Science, Dankook University, Cheonan, 31116, Republic of Korea.

Tissue engineering and regenerative medicine
|January 13, 2026
PubMed
Resumen

Un nuevo sistema de flotabilidad neutra simula la microgravedad para la investigación celular. Este método de bajo costo mantiene la pluripotencia de las células madre mesenquimales humanas e influye en la diferenciación, ofreciendo una plataforma accesible para estudios de biología espacial.

Palabras clave:
DiferenciaciónMicrogravedadFlotabilidad neutra

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Área de la Ciencia:

  • Biotecnología e Ingeniería Biomédica
  • Biología Celular e Investigación con Células Madre
  • Biología Espacial y Astrobiología

Sus antecedentes:

  • La investigación sobre microgravedad es crucial para comprender los fenómenos biológicos, pero enfrenta limitaciones de costo, accesibilidad y simulación precisa.
  • Los simuladores terrestres existentes a menudo introducen artefactos como estrés de cizallamiento y vibración, lo que dificulta la replicación realista de la microgravedad.
  • Existe la necesidad de sistemas de microgravedad simulada simples, de bajo costo y reproducibles.

Objetivo del estudio:

  • Desarrollar un sistema de microgravedad simulada simple, de bajo costo y reproducible utilizando flotabilidad neutra.
  • Evaluar la estabilidad de los esferoides de células madre mesenquimales derivadas de médula ósea humana (hBMSC) en el entorno simulado.
  • Investigar los efectos de la microgravedad simulada por flotabilidad neutra en la pluripotencia y la diferenciación trilineal de hBMSC.

Principales métodos:

  • Se creó un medio de flotabilidad neutra (MFN) mezclando medio de cultivo celular con medios de gradiente de densidad (Ficoll-Paque™, Percoll™, Optiprep™).
  • Se evaluó la estabilidad de flotabilidad de los esferoides de hBMSC experimentalmente y mediante dinámica de fluidos computacional (CFD).
  • Se compararon los efectos de la microgravedad simulada en 3D (3D-sim-μg) en la pluripotencia y diferenciación de hBMSC frente a controles de gravedad normal.

Principales resultados:

  • Un MFN a base de Optiprep (20/80 v/v) proporcionó una suspensión estable para esferoides de hBMSC durante hasta 14 días.
  • El análisis CFD confirmó una presión estática cercana a cero, validando el entorno similar a la microgravedad.
  • Los esferoides de hBMSC en 3D-sim-μg exhibieron una mayor expresión de marcadores de pluripotencia, suprimieron la diferenciación osteogénica y aumentaron la diferenciación adipogénica y condrogénica en comparación con la gravedad normal.

Conclusiones:

  • El sistema basado en flotabilidad neutra simula eficazmente los comportamientos celulares inducidos por microgravedad, incluido el mantenimiento de la pluripotencia y la diferenciación específica de linaje.
  • Este enfoque ofrece una plataforma simple, accesible y reproducible para diversas investigaciones sobre microgravedad.
  • Los hallazgos respaldan la utilidad de este sistema para estudiar las respuestas celulares en entornos espaciales simulados.