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Velocity Pressure Formula

GoVelocity Pressure using Wind Pressure Formula

GoVelocity Pressure as given by ASCE 7 Formula

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Velocity Pressure is the pressure required to accelerate air from zero velocity to some velocity and is proportional to the kinetic energy of the air stream. Check FAQs

q = 0.00256 \cdot K z \cdot K zt \cdot K d \cdot ({V B}^{2}) \cdot I

q - Velocity Pressure?K_z - Velocity Exposure Coefficient?K_zt - Topographic Factor?K_d - Wind Directionality Factor?V_B - Basic Wind Speed?I - Importance Factor for End Use?

Velocity Pressure Example

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With units

Only example

Here is how the Velocity Pressure equation looks like with Values.

Here is how the Velocity Pressure equation looks like with Units.

Here is how the Velocity Pressure equation looks like.

20 = 0.00256 \cdot 0.85 \cdot 25 \cdot 0.78 \cdot ({29.6107}^{2}) \cdot 0.8

20pdl/ft² = 0.00256 \cdot 0.85 \cdot 25 \cdot 0.78 \cdot ({29.6107m/s}^{2}) \cdot 0.8

20 = 0.00256 \cdot 0.85 \cdot 25 \cdot 0.78 \cdot ({29.6107}^{2}) \cdot 0.8

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Velocity Pressure Solution

Follow our step by step solution on how to calculate Velocity Pressure?

FIRST Step Consider the formula

q = 0.00256 \cdot K z \cdot K zt \cdot K d \cdot ({V B}^{2}) \cdot I

Next Step Substitute values of Variables

∴

q = 0.00256 \cdot 0.85 \cdot 25 \cdot 0.78 \cdot ({29.6107m/s}^{2}) \cdot 0.8

Next Step Prepare to Evaluate

∴

q = 0.00256 \cdot 0.85 \cdot 25 \cdot 0.78 \cdot ({29.6107}^{2}) \cdot 0.8

Next Step Evaluate

∴

q = 29.7632832832957Pa

Next Step Convert to Output's Unit

∴

q = 20.0000029648233pdl/ft²

LAST Step Rounding Answer

∴

q = 20pdl/ft²

Velocity Pressure Formula Elements

Variables

Velocity Pressure

Velocity Pressure is the pressure required to accelerate air from zero velocity to some velocity and is proportional to the kinetic energy of the air stream.

Symbol: q

Measurement: PressureUnit: pdl/ft²

Note: Value should be greater than 0.

Formulas to find Velocity Pressure

Velocity Exposure Coefficient

Velocity Exposure Coefficient is evaluated at some height z.

Symbol: K_z

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Velocity Exposure Coefficient

Topographic Factor

Topographic Factor are also called indirect factors as they influence the growth and development of organisms by bringing variations in climatic factors.

Symbol: K_zt

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Topographic Factor

Wind Directionality Factor

Wind Directionality Factor reflects the fact that the climatologically and aerodynamically or dynamically most unfavourable wind directions typically do not coincide.

Symbol: K_d

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Wind Directionality Factor

Basic Wind Speed

Basic Wind Speed is the wind speed corresponding to a 3-s gust speed at 33 ft above the ground in Exposure C.

Symbol: V_B

Measurement: SpeedUnit: m/s

Note: Value should be greater than 0.

Formulas to find Basic Wind Speed

Importance Factor for End Use

Importance Factor for End Use is the factor whose value lies in range 0.8 to 1.2.

Symbol: I

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Importance Factor for End Use

Other Formulas to find Velocity Pressure

Go Velocity Pressure using Wind Pressure

q = \frac{p}{G \cdot C p}

Go Velocity Pressure as given by ASCE 7

q = \frac{p + q i \cdot GC pt}{G \cdot C ep}

Other formulas in Wind Loads category

Go Equivalent Static Design Wind Pressure

p = q \cdot G \cdot C p

Go Gust Response Factor using Wind Pressure

G = \frac{p}{q \cdot C p}

Go Pressure Coefficient using Wind Pressure

C p = \frac{p}{q \cdot G}

Go Basic Wind given Velocity Pressure

V B = \sqrt{\frac{q}{0.00256 \cdot K z \cdot K zt \cdot K d \cdot I}}

How to Evaluate Velocity Pressure?

Velocity Pressure evaluator uses Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use to evaluate the Velocity Pressure, The Velocity Pressure is defined as the velocity pressure when we know the basic wind speed and other factors affecting the velocity pressure like wind directionality factor, topographic factor etc. Velocity Pressure is denoted by q symbol.

How to evaluate Velocity Pressure using this online evaluator? To use this online evaluator for Velocity Pressure, enter Velocity Exposure Coefficient (K_z), Topographic Factor (K_zt), Wind Directionality Factor (K_d), Basic Wind Speed (V_B) & Importance Factor for End Use (I) and hit the calculate button.

FAQs on Velocity Pressure

What is the formula to find Velocity Pressure?

The formula of Velocity Pressure is expressed as Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use. Here is an example- 27.03837 = 0.00256*0.85*25*0.78*(29.6107^2)*0.8.

How to calculate Velocity Pressure?

With Velocity Exposure Coefficient (K_z), Topographic Factor (K_zt), Wind Directionality Factor (K_d), Basic Wind Speed (V_B) & Importance Factor for End Use (I) we can find Velocity Pressure using the formula - Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use.

What are the other ways to Calculate Velocity Pressure?

Here are the different ways to Calculate Velocity Pressure-

Velocity Pressure=Wind Pressure/(Gust Response Factor*Pressure Coefficient)
Velocity Pressure=(Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*External Pressure Coefficient)

Can the Velocity Pressure be negative?

No, the Velocity Pressure, measured in Pressure cannot be negative.

Which unit is used to measure Velocity Pressure?

Velocity Pressure is usually measured using the Poundal per Square Foot[pdl/ft²] for Pressure. Pascal[pdl/ft²], Kilopascal[pdl/ft²], Bar[pdl/ft²] are the few other units in which Velocity Pressure can be measured.

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Velocity Pressure Formula

​GoVelocity Pressure using Wind Pressure Formula

​GoVelocity Pressure as given by ASCE 7 Formula

Velocity Pressure Example

Velocity Pressure Solution

Velocity Pressure Formula Elements

Other Formulas to find Velocity Pressure

Other formulas in Wind Loads category

How to Evaluate Velocity Pressure?

FAQs on Velocity Pressure

Variable Name

GoVelocity Pressure using Wind Pressure Formula

GoVelocity Pressure as given by ASCE 7 Formula