answersLogoWhite

0

Depends whether it is sustained force or not.

Note1: In this answer 'g' is used to refer to g-force not grams

Note2: The g-force of an object is its equal to its acceleration relative to free-fall. This means that an object on earth that is not falling or rising (relative to gravity) is experiencing 1g (0g being weightless). This in turn also means that 1g is equal to your weight etc


Human tolerances depend on the magnitude of the g-force, the length of time it is applied, the direction it acts, the location of application, and the posture of the body. The human body is flexible and deformable, particularly the softer tissues. A hard slap on the face may briefly impose hundreds of g locally but not produce any real damage; a constant 16 g for a minute, however, may be deadly.

Vertical axis g-force

Aircraft, in particular, exert g-force along the axis aligned with the spine. This causes significant variation in blood pressure along the length of the subject's body, which limits the maximum g-forces that can be tolerated.

In aircraft, g-forces are often towards the feet, which forces blood away from the head; this causes problems with the eyes and brain in particular. As g-forces increase a Brownout can occur, where the vision loses hue. If g-force is increased further tunnel vision will appear, and then at still higher g, loss of vision, while consciousness is maintained. This is termed "blacking out". Beyond this point loss of consciousness will occur, sometimes known as "G-LOC" ("loc" stands for "loss of consciousness"). Beyond G-LOC, if g-forces are not quickly reduced, death can occur.

While tolerance varies, with g-forces towards the feet, a typical person can handle about 5 g (49m/s²) before g-loc, but through the combination of special g-suits and efforts to strain muscles-both of which act to force blood back into the brain-modern pilots can typically handle 9 g (88 m/s²) sustained (for a period of time) or more.

Resistance to "negative" or upward g's, which drive blood to the head, is much lower. This limit is typically in the −2 to −3 g (−20 m/s² to −30 m/s²) range. The subject's vision turns red, referred to as a red out. This is probably because capillaries in the eyes swell or burst under the increased blood pressure.

Horizontal axis g-force

The human body is better at surviving g-forces that are perpendicular to the spine. In general when the acceleration is forwards, so that the g-force pushes the body backwards (colloquially known as "eyeballs in") a much higher tolerance is shown than when the acceleration is backwards, and the g-force is pushing the body forwards ("eyeballs out") since blood vessels in the retina appear more sensitive in the latter direction.

Early experiments showed that untrained humans were able to tolerate 17 g eyeballs-in (compared to 12 g eyeballs-out) for several minutes without loss of consciousness or apparent long-term harm.

User Avatar

Wiki User

15y ago

What else can I help you with?

Related Questions

How much force can the femur withstand units per square inch?

The femur, the strongest bone in the human body, can withstand compressive forces of around 1,700 to 2,500 pounds-force per square inch (psi) before breaking.


How much air is pressing on the human body?

The atmospheric pressure at sea level is 14.7 pounds per square inch (14.7 psi)


How much psi can a human take?

The maximum amount of pressure a human body can withstand varies depending on the circumstances and individual factors. In general, most people can tolerate around 1 to 2 pounds per square inch (psi) of pressure changes without adverse effects. However, exposure to higher pressures, such as those experienced in scuba diving or during certain medical treatments, can be dangerous and should be carefully monitored by trained professionals.


What is the maximum amount of pressure in pounds per square inch (psi) that steel can withstand?

Steel can withstand a maximum pressure of around 30,000 pounds per square inch (psi).


How much pressure can a rocket withstand?

Rockets can withstand high pressures during launch, typically around 500-1000 psi for the fuel tanks and up to several thousand psi for the combustion chamber. The exact pressure tolerance depends on the design and materials used in the rocket's construction.


What does mean concrete 3000 psi?

Concrete 3000 psi means that the concrete has a compressive strength of 3000 pounds per square inch (psi). This measurement indicates how much pressure the concrete can withstand before cracking or breaking. A higher psi value generally means stronger and more durable concrete.


How much PSI can pot metal handle?

Pots are not usually made to withstand large pressures. In any case, it would depend on the thickness of the pot.


How much pressure can JB Weld hold before it fails?

JB Weld can typically withstand pressures up to 3,960 psi before it fails.


How thick would acrylic have to be to withstand an internal force of approximately 1200 psi?

To withstand an internal force of 1200 psi, the acrylic would need to be at least 1 inch thick. Acrylic typically has a tensile strength of around 10,000 psi, so a 1-inch thickness would comfortably handle the 1200 psi force.


How much pressure can iron withstand?

Iron can withstand pressures of around 60,000 to 75,000 pounds per square inch (psi) before it starts to deform or fail. This can vary depending on factors like the type of iron, its structure, and temperature.


What is pressure on human body at 30 foot dept of water?

Every one feet the pressure raises by 24.9 psi.


How much pressure can a 140 pound human exert with its teeth?

780 psi per square cm