Question

Intravenous infusions are usually driven by gravity by hanging the bottle at a sufficient height to counteract the blood pressure in the vein and to force the fluid into the body. The height the bottle is raised, the higher the flow rate of the fluid will be.
a) If it is observed that the fluid and the blood pressures balance eachother when the
bottle is 1.2 m above the arm level, determine the gage pressure of the blood. (b) If the gage pressure of the fluid at the arm level needs to be 20 kPa for sufficient flow rate, determine how high the bottle must be placed. Take the density of the fluid to be 1020 kg/m3.

Answer 1

Answer:

(a) BP = 11.99 KPa

(b) h = 2 m

Explanation:

(a)

Since, the fluid pressure and blood pressure balance each other. Therefore:

BP = ρgh

where,

BP = Blood Pressure

ρ = density of fluid = 1020 kg/m³

g = acceleration due to gravity = 9.8 m/s²

h = height of fluid = 1.2 m

Therefore,

BP = (1020 kg/m³)(9.8 m/s²)(1.2 m)

BP = 11995.2 Pa = 11.99 KPa

(b)

Again using the equation:

P = ρgh

with data:

P = Gauge Pressure = 20 KPa = 20000 Pa

ρ = density of fluid = 1020 kg/m³

g = acceleration due to gravity = 9.8 m/s²

h = height of fluid = ?

Therefore,

20000 Pa = (1020 kg/m³)(9.8 m/s²)h

h = 2 m

Answer 2

As per the intravenous infusion that is usually taken by the gravity of hanging bottle at a driven at height aerated to the BP.

• The BP = ρgh   ρ = density of fluid = 1020 kg/m³ g = of gravity = 9.8 m/s². h = height of fluid = 1.2 m. Therefore,  BP = (1020 kg/m³)(9.8 m/s²)(1.2 m)

• BP = 11995.2 Pa = 11.99 KPa

• (b)  Again using the equation: P = ρgh with data: P = Gauge Pressure = 20 KPa = 20000 Pa = density of fluid = 1020 kg/m³ = gravity = 9.8 m/s²

Thus , Pa = (1020 kg/m³)(9.8 m/s²)h = h = 2 m

Learn more about the usually driven by gravity.

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