Fluids Flashcards
Force acting perpendicular to the surface is called
Thrust
The force or unit area acting on an object called
Pressure=
Thrust/area of contact
Si unit of thrust N
Si Unit of pressure. Pascal or
Pressure unit N/m^2
Pressure exerted by a liquid at a point is determined by
Depth
density of liquid
acceleration due to gravity
Pressure due to a liquid colum
¶hg
Mass of the liquid
Volume of liquid × density
¶v
The instrument used to measure atmospheric pressure is called
Barometer
The Mercury barometer first designed by an Italian physicist
Torricelli
On your typical day at sea level the height of Mercury column is
760 mm
76 cm
1atm=
1bar
1atm=1.01310^5 pa
1bar= 110^5pa
1atm=1.013 bar
On which one metre square of surface the force acting is
1.013 kN
1 absolute pressure is zero reference against
2 Gauge pressure is zero reference against
1 Perfect vacuum
2 atmospheric pressure
In petrol bunks the tyre pressure of vehicle is measured in a unit called
Pascal per inch ( psi)
The law state that external pressure applied on a in compressible liquid is transmitted uniformly throughout the liquid
Pascal’s law
Blaise Pascal
French
1623-1662
Pascal’s law became the basis for one of the important machines ever developed
Hydraulic press
The hydraulic system working in this way are known as
Force Multiplier
The SI unit of density is
Kilogram per metre cube
The density of substances is
Mass/volume of substances
Generally density of substance is compare with the density of water at 4 degree Celsius because density of water at this temperature is
1g/cm^3
Density of any other substance with respect to the density of water at 4 degree Celsius is called
Relative density
or specific gravity (if the referenced substances is water)
The ratio of mass of a given volume of a substance to the mass of an equal volume of water at 4 degree Celsius denotes
Relative density
or specific gravity (if the referenced substances is water)
Relative density can be measured using
Pycnometer or density bottle
Density bottle can be used to measure
Relative density
or specific gravity (if the referenced substances is water)
If the density of a substance is less than the density of liquid
It will float
A direct reading instrument used for measuring the density are relative density of a liquid is called
Hydrometer
Hydrometer is based on the principle of
Principal of flotation
The weight of a liquid displaced by the immersed portion of hydrometer is equal to weight of the hydrometer
Hydrometer maybe calibrator for different uses such as
Lactometer
saccharometer
alcoholometers
Density of milk is measured by
Density of sugar in a liquid measured by
Higher level of alcohol in spirits is measured by
Lactometer
Saccharometer
Alcoholometers
Lactometer work on the principle of
Gravity of milk
The pressure is more on the bottom less are the top of the liquid. This pressure difference causes a force on the object and pushes it upward. This course is called______&. Phenomenon is called_______
Buoyant force
Buoyancy
Saltwater provides more Buoyant force than freshwater
Buoyant Force depends as much on the density of liquid as on the volume displaced
_________is an instrument that demonstrate the principle of buoyancy
Cartesian driver
Archimedes principle is the consequence of ________ law
Pascal
Archimedes devised principles of the________ after he noticed his own apparent loss in weight while sitting in his bath
Hydrostatic balance
Archimedes principle
State the body immersed in a fluid experiences vertical upward buoyant force equal to the weight of the fluid it displaces
The correct lactometer reading is obtained only at the temperature of
60°F
Law of flotation
The weight of your floating body in a fluid is equal to weight of the fluid displaced by the body
The centre of gravity of the floating body and the centre of buoyancy are in the same vertical line
Flotation therapy uses water that contain Epson salt rich in
Magnesium
As a floater glasses relaxes he or she is obsorbing this magnesium through the skin. Magnesium body to process insulin which lower a person’s risk of developing type 2 diabetes
Cartesian driver is an experiment which demonstrate the principle of
Buoyancy and ideal gas law
Unit of relative density
No unit
_____ is a device used to measure the relative density of liquid based on the Archimedes principle
Hydrometer
lactometer Is a device used to check the purity of milk by measuring you its density using
Archimedes principle
Clouds float in atmosphere because of the their
Low Density
They drinking straw work on the existence of
Atmospheric pressure
1gwt
980 dyne
The frictional force exerted by fluids is also called .
drag
