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To gain an heuristic grasp of gravitational pressure, let us begin by making three obvious assertions: 1. Pressure has units of force per unit area: In MKS units, we write p = N/m2. 2. Any quantity multiplied by unity remains unchanged: S x (1) = S. 3. The rules of algebra apply to the units of denominate numbers just as they apply to the numbers themselves: e.g., (m/s) X s = m. Let us now write unity in denominate terms of meters divided by meters: 1 = m/m, and multiply pressure by this term. We obtain a term identical to pressure but with units energy per unit volume or energy density: (N/m2)(m/m) = (Nm/m3) = J/m3. In electrodynamics, by way of comparison,we study the energy density of the electromagnetic field in terms of the electromagnetic constants of free space and the squares of the field values. For the electric field, the energy density (as a scalar) has the form (1/2)e0E2 where e0 is the dielectric constant of free space and E is the local electric field. The gravitational equivalent of e0 has the form 1/4(Pi)G where G is Newton's constant of gravitation (N.B., for comparison, e0 = i/4(Pi)k where k is Coulomb's constant). We may write, therefore, that gravitational energy density (pressure) must have the [classical or Newtonian] form ag2/8(pi)G where a is a constant to be determined. If the analogy with the electric field case strictly holds, then a = 1. Since the gravitational field is an energy field, it is appropriate to speak of its energy per unit volume. This concept emerges in general relativity. Anecdotally, Maxwell spoke of the "pressures" of the electric and magnetic fields, using terminology for energy density that is now regarded as out-of date. Joseph C. Kolecki Retired NASA planetary physicist
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∙ 16y ago
Gravitational pressure is the force exerted by a celestial body, such as a planet or star, due to its gravitational pull. This pressure is felt by objects near the surface of the body and increases as you move closer to its center. It plays a crucial role in determining the structure and behavior of celestial bodies.
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Weight is the result of air pressure exerted upon an object?
Weight is the result of the mutual forces of gravitational attraction between the object and another mass. It has nothing to do with air pressure.
How does atmospheric pressure varies with depth?
The pressure increases as the atmosphere gets deeper. At lower levels of the atmosphere there is more fluid above that is being pulled by Earth's gravitational force .So, there is more pressure at lower levels of the atmosphere.
Why pressure increases with depth?
preasure is increased due to the overwhelming gravitational pull from the core of our planet, it's the same force that created the planet. so the closer you get to it the greater the pull felt on each individual molecule,increasing the pressure.
Does atmospheric pressure increase or decrease under sea level?
It increases. The lower you go, the more mass there is in the column of air (or water) above you. The earth's gravitational attraction pulls that column downward. In a fluid, the pressure is equal in all directions.
How does pressure change as you go from the surface toward the center of earth?
All matter (something that has mass and takes up space) on and near Earth is subject to the pull from the Earth's gravitational field, with an acceleration rate of 9.8 m/sec. In other words, the Earth's gravity field is trying to pull every bit of matter toward the center of the Earth.
Atmospheric pressure is a consequence of what?
The gravitational force on the Earth's air.
How is pressure in the liquid related to depth?
Pressure in a liquid is directly proportional to the depth of the liquid. As depth increases, the weight of the liquid above exerts more force downwards, increasing the pressure at that depth. This relationship is described by the equation P = ρgh, where P is the pressure, ρ is the density of the liquid, g is the acceleration due to gravity, and h is the depth.
Air pressure exerted equally on an object from different directions is what 1. balanced pressure 2. gravitational pressure 3. fluid pressure 4. constant pressure?
1. balanced pressure
What is the relationship between liquid pressure and the depth of a liquid between liquid pressure and density?
pressure of liquid on bottom=density*gravitational force*depth :)
Where in the sun do most of the nuclear reactions occur?
At the center, where the gravitational pressure is highest.
When does a forming star become stable?
Usually, gravitational collapse of the protostar is stopped after hydrogen fusion starts in the center. Then gravitational forces and radiation pressure are in equilibrium.
How is pressure measured with a barometer?
by the earths gravitational pull the barometer can measure the amount of air pressure in the air, also because of carbons gases
If there is pressure on the inside and outside of a plastic bottle what is causing the force?
All liquids and and gases have pressure. Pressure is also a force but does not depend on area it acts. Pressure is arising from its own weight. The molecules in liquids and solids areattracted downward due to earth's mass(gravitational force). The impact of this gravitational force per unit area is the pressure. if there is a liquid or gas there must be pressure. the magnitude of pressure inside a plastic bottle depends on the weight of the air in it.
Why pressure is inversely proportional to velocity in bernoulli's equation?
In Bernoulli's equation, pressure is inversely proportional to velocity because of the conservation of energy principle. When the fluid speed increases, its kinetic energy increases at the expense of its pressure energy, and vice versa. This relationship between pressure and velocity ensures that total mechanical energy along a streamline remains constant in an ideal fluid flow.
Which of the two forces are important in floating bodies?
water pressure which is effected by gravitational force and buoyancy
What is the gravitational pressure at sea level?
The gravitational pressure at sea level is approximately 101.3 kilopascals. This pressure comes from the weight of the air above us pressing down on Earth's surface due to gravity.
What is the relationship between water depth an pressure?
The relationship between water depth and pressure is linear. As water depth increases, the pressure exerted by the water also increases. This relationship is described by the hydrostatic pressure formula, which states that pressure is directly proportional to the depth of the fluid and the density of the fluid.
