Question

define pressure and types of pressure and also explian its consequences ?​

Answer 1

$\large{\mathfrak{\underline{\underline{Question:-}}}}$

Define pressure and types of pressure and also explian its consequences?

$\large{\mathfrak{\underline{\underline{Answer:-}}}}$

➡️$\large{\mathcal{\underline{\underline{\red{PRESSURE:-}}}}}$

$\star$ Pressure is an expression of force exerted on a surface per unit area.

$\star$ The standard unit of pressure is the pascal (Pa), equivalent to one Newton per meter squared (N/m^2).

$\star$ Pressure can be measured in dyne per centimeter squared (dyn/cm^2).

$\star{\boxed{\boxed{\bf{Pressure = \frac{force}{area}}}}}$

➡️$\large{\mathcal{\underline{\underline{\red{TYPES\:OF\:PRESSURE:-}}}}}$

$\large{\mathbf{\underline{\underline{1).\: Atmospheric\:Pressure:-}}}}$

$\star$ The pressure exerted by the weight of the atmosphere, which at the sea level has a mean value of 101,325 pascal.

$\large{\mathbf{\underline{\underline{2).\: Absolute\:Pressure:-}}}}$

$\star$ Absolute pressure is the pressure above the absolute zero of the pressure, measured at absolute zero temperature or in complete vaccum.

$\large{\mathbf{\underline{\underline{3).\: Differential\:Pressure:-}}}}$

$\star$ Difference of pressure measurements between two points in a system is known as differential pressure.

$\large{\mathbf{\underline{\underline{4).\: Gauge\:Pressure:-}}}}$

$\star$ The reading on a pressure gauge, which is the difference between two pressure, is known as Gauge pressure.

➡️$\large{\mathcal{\underline{\underline{\red{CONSEQUENCES\:OF\:PRESSURE:-}}}}}$

$\star$ Water.

$\star$ Air movement.

$\star$ Cloud.

$\star$ Rainfall.

$\star$ Tornadoes.

$\star$ Hurricanes.

Answer 2

$\huge\bf{\pink{\mid{\overline{\underline{your \:answer}}}\mid}}$

$\large{\underline{\underline{\mathbf{Pressure:-}}}}$

Pressure (P) is defined as the magnitude of the normal force acting per unit surface area.

✡ Pressure = ∆F/∆A

★ $\rm{\underline{SI\: Unit-}}$Pascal(Pa)

1Pa = N/m²

★ $\rm{\underline{Dimensions-}}$

$| {ml}^{ - 1} {t}^{ - 2} |$

★ $\bold{ pressure\:is \:a \:scalar\:quantity.}$

This is because hydrostatic pressure is transmitted equally in all direction when force is applied, which shows that pressure is not associated with a definite direction.

$\small{\underline{\underline{\mathbf{Consequences\:of \:pressure:-}}}}$

✒ Railway tracks are laid on wooden or iron sleepers. this is because the Weight of the train is spread over a large surface area of the sleeper. this reduce the pressure acting on the ground.

✒ A sharp knife is more effective in cutting the objects than a blunt knife.

Pressure exerted = force/area

the sharp knife transmits force over a small area as compared to the blunt knife. hence, the pressure exerted in case of sharp knife is more than the blunt knife.

$\small{\underline{\underline{\mathbf{ Types\:of \:pressure:-}}}}$

★ Atmospheric pressure.

★ Gauge pressure.

★ Absolute pressure.

(1) $\rm{\underline{Atmospheric\: pressure- }}$

Force exeted by atmospheric columm on unit cross - sectional area at mean sea level is called Atmospheric pressure.

Atmospheric pressure = 101.3 KN/m²

✏ $\bold{"Barometer" \: is \: used \: to \: measure \: the\: atmospheric \: pressure}$

(2). $\rm{\underline{Gauge\: pressure- }}$

Excess pressure over the atmospheric pressure (P-Patm) measured with the help of pressure measuring instrument is called Gauge pressure.

$p_{gauge} = \frac{f}{a} = \frac{mg}{a} = \frac{volume \times density}{a}$

and,

$p_{gauge} = hpg$

✏ $\bold{Gauge\: pressure\: is\: measured\: by\: "manometer"}$

(3). $\rm{\underline{Absolute\: pressure-}}$

Sum of the atmospheric and gauge pressure is called Absolute pressure.

$p_{abs} = p_{atm} + p_{gauge}$