Properties Of Fluids And Pressures Flashcards
Fluid
The substance which can flow called as fluid
Liquids and gases
Pressure
The force acting on unit surface area
Force / area
Newton / mt 2
Si unit of pressure pascal
Pascal principal
The pressure applied at any point in a fluid can equally distributed among the all directions without change
Applications of pascal principle
Hydraulic machines
Hydraulic lifts
Hydraulic brakes
Hydraulic cranes
Extraction of oils from oil seeds
Compression of the cotton bales
Atmospheric pressure
The air surrounded on the earth is called atmospheric pressure, the pressure created around it
1 atm 1.01 * 10 ^ 5 . Pasacal
1 bar 10 power 5
1 tarr 133 pascal
CM of hg 76 cms
Mm of hg 760 mm
Important points
Wind velocity measured with animometer
Atmospheric pressure measured with barometer
Barometer invented by taricelli
Mercury is used in barometer, mercury has high density 13.6 g/ cc
For moving heights the atmospheric pressure decreases. How much for every 273 meters 2.54 cms
Sudden fall of barometer
Stormss
Slow fall of barometer reading causes rainfall,
Slow rising of barometer reading clean weather
Bernoulli principles
Objects or fluids always flows from higher pressure region to lower pressure region
Applications of Bernoulli
Aeroplane are able to fly against the gravitational force
Areoplane wings ki kinda high pressure create chestaru paina emo low pressure andukani kinda nundi avi paiki egaradaniki help avuthai
Down high pressure and low velocity
High pressure nundi low pressure ki move avuddii,
2 Roof, kites ,calendar,
Spin bowling.
Working of carburetor
Sprayers,lopala high pressure create vhesyharu bayatat low pressure tho vasthundi,
Venturi meter works on the principle of Bernoulli
Working principle of pressure cooker
With increase of height atmosphering pressure decrease so we are not able to cook food without pressure cooker
Working principle of pressure cooker
If pressure increases boiling point of water also increase deeni ardam entante normal ga boiling point of water 100 aithe pressure increase cheyadam valla water 100 dagara boil avvali kani avvavu, 120 varaku alane untadi water chala vediga avuthaii, anduke ah vediki inka ekkuva boil avuddi, anduke pressure cooker lo pettinavi fast ga boil avuthai
If pressure decreases boiling point of water also decrease
Working principle of skating game
If pressure increases melting point decreases.
If pressure decreases melting point increases
Melting point of ice zero degrees, akkada matrame water ga change avuddii adi konchem water aithene manam skating cheyagaalam lekapothe cheyaledu pressure increaee melting point taggudiii
Why Austronauts wear special dresses
Space lo atmospheric pressure zero, mana body fluids pass avuthu untai, lopala high pressure tho Bernoulli prakaram fluid anedi high pressure nundi low pressure ki flow avvuddii apuduu space lo notlo nundi mukkullo nundi blood vasthadii andukosame
Austronauts space suits wear chetsaru
We are able to drink cooldrinks with help of straw
Due to the presence of atmospheric pressure, we are able to drink cool drinks with help of straw lekapothe thagalenu, space loki velthe water ni thagalante pindi noru teri hi thagutharu, for example cup lo tea poyali anna Sare posthunaouduu etu pothayoo kuda chepalemu, galilo untaii avi alane
Aeroplane lo una fountain pen enduku kakkuddii ante, aeroplane lo , fountain pen lopala una high pressure, valla bayataki vachestadi,
Why we are not able to feel atmospheric pressure
The pressure inside our body is equal to the atmospheric pressure
Kon tha mandiki paiki velthunte vomiting vasthadi
Boyles law
If temperature is constant,
Pressure is inversely proportional to volume
If pressure increases volume decreases.
If pressure decreases volume increases
For example bowl teskoni dani ninda gas undi pani undi pressure apply chesthe volume taggudidii, pressure taggiste volume peruguddii,.
Boyles law lo temperature constant ani chepthunam,
Charles law
Pressure is constant
Volume directly proportional to temperature
Temperature ni penchithe volume peruguddii
Temperature taggisthe volume tagguddii
Oka bowl teskoni kinda baga heat chesthunte temperature penchithe volume kuda peruguddii
If volume is constant
Pressure is directly proportional to temperature.
Temperature increases pressure increase
Temperature decreases pressure decreases
Universal ideal gas equation
The gas which follow both Boyles and Charles law called
At high temperature and low pressure the normal gas behaves like a ideal gas
Pv = nrt
P pressure b
V volume
N no of moles
T temperature
R = universal ideal gas constant
R = 8.314
Surface tension
The property of upper layer of a liquid tending to occcur least surface area is called surface tension
Force kinda nundi pani chesthunte adi area tagginchukovadaniki chusthadi,
Surface tension = force/ length
Si newton / metre n l
Soap bubbles gani merchry bubbles
Paint brush
Hair oil application
Kerosonee spill chestaeu chanipovadaniki, the shape of the rain drops soap bubbles mercury bubbles in spherical shape due to surface tension
A still water surface act as stretched layer allowing mosquitoes and other insects to move freely
When a painting brush is dipped in a paint and pullled out all it’s bristles comes close to each other
Washing clothes in hot water
Clothes washing in hot water to clean neat because it reduces surface tension
Surface tension decreases when temperature increases
But platinum and copper increases when temperature increases
Viscosity
Viscosity is the property of a fluid which offers resistance to movement of 1 layer of the liquid over the another adjacent side of the layer
Units of the viscosity poise
Greese has high viscosity
Applications of the viscosity
The speed of the person descendinh with the help of parachute gradually decreases due to viscosity of the gases hence the velocity is very less when person reachee to ground.
Rain drops falled the speed is reduced by the viscosity between the layers of gases so speed of the rain drop decreases
Tides sea madyalo nundi vasthai, oddu dagariki vachesariki slow avuthai oka layer inko layer tsgulukoni taggipothai
Liquids lo temperature increases then viscosity decreases.
As temperature increases in gases the change of momentum between molecules increase so that their viscosity increases
Capilarity
Sponge
Kerosene stove.
Tree,
Liquids with the help of small holes raised their levels
Blood circulatory system
Using cotton clothes in summer absorb the sweat
