Pressure Contents: How to calculate Whiteboards Gauge pressure.

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Presentation transcript:

Pressure Contents: How to calculate Whiteboards Gauge pressure

Pressure is in Force per unit area F = Force in N A = Area in m2 P = pressure in N/m2 (Pascals - Pa) Show what a Pa is (atm in each Pa, lb/in2) In a fluid– Same in all directions, perp to walls.

Pressure is in Force per unit area F = Force in N A = Area in m2 P = pressure in N/m2 (Pascals - Pa) Example - A 2.4 kg box measures 15 cm by 25 cm on the base. What is the pressure under the box? (630 Pa – snowshoes vs. spike heels)

Pressure 1 | 2 | 3

What is the pressure of 42 N on a 20. cm x 32 cm plate? 660 Pa

What force does 3.200 kPa exert on a 78.0 cm x 182 cm pane of glass?

A hydraulic jack lifts a 31,360 N car using a pressure of 1 A hydraulic jack lifts a 31,360 N car using a pressure of 1.38 MPa (M = x 106) What is the diameter of the cylinder? 0.170 m

Converting units of pressure 1 atm = 1.013x105 Pa = 101.3 kPa = 760. torr = 14.7 PSI (1 bar = 1x105 Pa, so 1 atm = 1.013 bar) Convert 2.10 atm to Pa: (2.13x105 Pa) Convert 345 torr to Pa: (4.60x104 Pa) Convert 2.45x104 Pa to PSI: (3.56 PSI)

Conversions 1 | 2 | 3

Convert 32 psi to kPa 1 atm = 1.013x105 Pa = 101.3 kPa = 760. torr = 14.7 PSI 220 kPa

Convert 890 Torr (mm Hg) to Pa 1 atm = 1.013x105 Pa = 101.3 kPa = 760. torr = 14.7 PSI 1.2x105 Pa

Convert 2000 psi to atm: 1 atm = 1.013x105 Pa = 101.3 kPa = 760. torr = 14.7 PSI 136 atm ≈ 100 atm

Gauge pressure Most pressure gauges compare to Atmospheric Gauge pressure is how much more a pressure is than atmospheric (i.e. this room is at 0 Gauge - Absolute P is 1 atm more) P = Pgauge + PAtm P = Absolute (actual) pressure Pgauge = Gauge pressure PAtm = Atmospheric pressure

Gauge pressure P = Pgauge + PAtm P = Absolute (actual) pressure Pgauge = Gauge pressure PAtm = Atmospheric pressure 1 atm = 1.013x105 Pa = 101.3 kPa = 760. torr = 14.7 PSI Example 1 – If your tyre pressure gauge reads 220 kPa, what is the actual pressure in the tyre in kPa and Pa? (320 kPa, 3.2E5Pa)

Gauge pressure P = Pgauge + PAtm P = Absolute (actual) pressure Pgauge = Gauge pressure PAtm = Atmospheric pressure 1 atm = 1.013x105 Pa = 101.3 kPa = 760. torr = 14.7 PSI Example 2 – What is the gauge pressure if you have an actual pressure of 1072 Torr? (312 Torr)

Gauge pressure

Gauge Pressure 1-4

What is the absolute pressure if you read 35 psi gauge What is the absolute pressure if you read 35 psi gauge? Answer in psi and Pascals 1 atm = 1.013 x 105 Pa = 101.3 kPa = 760 Torr = 14.7 psi 49.7 psi, 3.42E5 Pa

If you have an absolute pressure of 812 Torr, what is the gauge pressure? Answer in Torr 1 atm = 1.013 x 105 Pa = 101.3 kPa = 760 Torr = 14.7 psi 52 Torr

What is the absolute pressure if the gauge pressure is 2. 17 x 105 Pa What is the absolute pressure if the gauge pressure is 2.17 x 105 Pa. Answer in Pa. 1 atm = 1.013 x 105 Pa = 101.3 kPa = 760 Torr = 14.7 psi 3.18 x 105 Pa

If you have an absolute pressure of 42 If you have an absolute pressure of 42.0 kPa, what is the gauge pressure in kPa? 1 atm = 1.013 x 105 Pa = 101.3 kPa = 760 Torr = 14.7 psi -59.3 kPa