Semi trucks have air brakes, no hydraulics some very old trucks had air over hydraulic systems but they used no more pressure than any other system
Hydraulic oils are used in hydraulic systems to power them. There are different hydraulic oils with different levels of viscosity. The higher the viscosity normally the more efficient the pumping system will be.
Pneumatic systems use air or a gas which is compressible. When compressed, water can form in pneumatics.Hydraulic systems use oil or a transmission fluid, which is comparatively uncompressible, meaning more efficient power transmission and higher operating pressures.
Pascal's law states that pressure applied to a confined fluid is transmitted undiminished in every direction. In a hydraulic braking system, this principle allows for the transmission of force from the brake pedal to the brake calipers through the brake fluid, resulting in effective braking. The system benefits from hydraulic multiplication, allowing a small force on the brake pedal to generate a larger force at the brake calipers.
In the human body, the cardiovascular system operates similar to a hydraulic system, with the heart acting as a pump to circulate blood. The respiratory system works like a pneumatic system, with the lungs using air pressure to facilitate breathing.
By "Hydrostatic" systems one tends to mean "closed loop hydraulic systems". That is hydraulic systems comprising a pump and motor hwere the pump supplies the motor whose return side supplies the pump. The speed and direction of rotation of the hydraulic motor being changed according to the displacement angle of the variable displacement axial pison pump. "Open loop hydraulic systems" on the other hand comprises various motors often one or more "linear motors" (hydraulic cylinders). When using hydraulic cylinders in hydraulic systems one needs a reservoir to be able to hold the various volume need of the cylinder. (the displacement on the piston side is usually bigger than the rodside). The reservoir needs a "breather" due to the varous displacement needs hence the "open system".
the hydraulic system is used to make your car more fun where u can make it bounce
A hydroboost system uses hydraulic pressure from power steering pump to assist brake pedal application, providing increased brake force without directly using the engine vacuum. When you press the brake pedal, hydraulic pressure from power steering pump is used to boost the force applied to the brakes, making braking easier and more efficient.
Pneumatic system is operated by compressed air while hydraulic system is operated with pressurised hydraulic oil or any type viscous oil. Hydraulic systems can usually produce higher control forces and work under extreme operating conditions. This is the system that is primarily used on aircraft to move control surfaces and engine controls. You can often classify pneumatic systems because they have a pump (gas pump) and hydraulic systems have a piston. That is the difference. Also, pneumatic systems are louder because it is a gas under pressure. 1. By definition, hydraulics is used in controlling or harnessing power with the use of pressurized fluids whereas pneumatics studies how pressurized gases influences mechanical motion or movement. 2. Hydraulics uses an incompressible fluid medium like oil whereas pneumatics uses a compressible gas like air. 3. Hydraulic applications demand greater pressures during operations that reach thousands of pounds per square inch whereas pneumatic applications only require 100 psi pressures more or less. 4. Most hydraulic applications generally use bigger components that pneumatic applications. 5. Hydraulic systems are generally more difficult to operate compared to pneumatic applications
Hydraulic systems rely on the incompressibility of liquids to transmit force effectively. Gases are compressible, which would lead to fluctuations in pressure and an inconsistent transmission of force in a hydraulic system. Liquids offer more predictable and stable performance for hydraulic applications.
Pump
I'm not sure what you mean but a compressor is a machine for compressing gas, it can compress all gasses. A compressor is a type of Pneumatic system. All Pneumatic systems compress air, or a gas of some kind. If you replace the gas with liquid, the system becomes Hydraulic rather than Pneumatic. Hydraulic systems require more powerfull pumps to drive them and high tensile hoses & seals through which to conduct the fluid. An air compressor is not suitable for use with liquid, as the pressures involved are generally far higher. The hydraulic equivelant of an air compressor would require a particular kind of liquid; one that is non-compressible. These liquids are manufactured specially for such systems. They are more or less the same as the brake fluid you would find in a car or other vehicle.