GASES

GAS LAWS:

UNIT CONVERSIONS

​Content objective today we will learn how to convert units of pressure.

Language objective: So that I will be able to apply this skill when solving pressure calculations.

Essential Question :I'll know I have got it when I answered: how many psi in 30 torr?

BELL RINGER

DESMOS

https://www.desmos.com/scientific

​LIST 3 REAL WORLD USES FOR GASES?

Multiple Choice

DOES PRESSURE REMAIN CONSTANT?

• YES

• NO

Pressure

⦿ Pressure- Force per unit area. Dependent on volume temperature. (Gas Laws)

⦿ Atmospheric Air Pressure- is the pressure exerted

by air in the atmosphere on the surface of the Earth.

1 atm

0.3 atm

0 atm

PRESSURE AT SEA LEVEL

​DOES AIR WEIGH ANYTHING?

​DRY ICE- why does its vapor settle?

​WHY DOES CARBO DIOXIDE VAPOR SETTLE?

Hotspot

Point to the area of lower pressure

GAS LAWS:

UNIT CONVERSIONS

CAN YOU RECALL UNITS USED TO MEASURE GAS PRESSURE?

Open Ended

RECALL UNITS YOU HAVE USED TO MEASURE GASES

Units of Pressure

Atmostphere – atm

Kilopascal – kPa

Torr – torr

Millimeters of mercury – mmHg

Pounds per square inch - psi

Units of Pressure

Atmostphere – atm

Kilopascal – kPa

Torr – torr

Millimeters of mercury – mmHg

Pounds per square inch - psi

Units of Pressure

Atmostphere – atm

Kilopascal – kPa

Torr – torr

Millimeters of mercury – mmHg

Pounds per square inch - psi

Units of Pressure

Atmostphere – atm

Kilopascal – kPa

Torr – torr

Millimeters of mercury – mmHg

Pounds per square inch - psi

Units of Pressure

Atmostphere – atm

Kilopascal – kPa

Torr – torr

Millimeters of mercury – mmHg

Pounds per square inch - psi

​Sometimes gas pressure meters have both units other times you need to convert

​So today we are going to learn how to convert

1 atm = 101.3 kPa = 760 mmHg =760 torr = 14.7 psi

​First, you have to know these are all equivalencies or equal measures.

Multiple Choice

Which measure is equal to 1 atm?

• 1 atm

• 1 psi

• 760 kpa

• 760 mmHg

• 101.3 torr

Units of Pressure EQUIVALENCIES

1 atm = 101.3 kPa = 760 mmHg =760 torr = 14.7 psi

Examples
Convert the following pressure units:
of a 12.50 psi football to atm

​ 1. Write the given

2. Use correct equivalency

3. Write given units below

4. mult across div by bottom

​EQUIVALENCY

​GIVEN

​X

​=

Units of Pressure EQUIVALENCIES

1 atm = 101.3 kPa = 760 mmHg =760 torr = 14.7 psi

Examples
Convert the following pressure units:
of a 12.50 psi football to atm

​ 1. Write the given

2. Use correct equivalency

3. Write given units below

4. Mult across div by bottom

​EQUIVALENCY

​GIVEN

​x

​=

COLLABORATION TIME

WORK WITH YOUR GROUP

SOLVE THE NEXT EXERCISES

​EQUIVALENCY

​GIVEN

​x

​=

​1. Write the given

2. Use correct equivalency

3. Write given units below

4. mult across div by bottom

​EQUIVALENCY

1 atm = 101.3 kPa = 760 mmHg =760 torr = 14.7 psi

Reorder

Reorder the following steps to convert gas units

• write the given

• use correct equivalency

• set the given units on the bottom of conversion factor

• multiply across divide by the bottom

1

2

3

4

• 1
• 2
• 3
• 4

​GIVEN

​EQUIVALENCY

​x

​=

​ 1. Write the given

2. Use correct equivalency

3. Write given units below

4. mult across div by bottom

​EQUIVALENCY

​x

1 atm = 101.3 kPa = 760 mmHg =760 torr = 14.7 psi

​GIVEN

​EQUIVALENCY

​x

​=

​ 1. Write the given

2. Use correct equivalency

3. Write given units below

4. mult across div by bottom

​EQUIVALENCY

​x

1 atm = 101.3 kPa = 760 mmHg =760 torr = 14.7 psi

​GIVEN

​EQUIVALENCY

​x

​=

​ 1. Write the given

2. Use correct equivalency

3. Write given units below

4. mult across div by bottom

​x

​EQUIVALENCY

1 atm = 101.3 kPa = 760 mmHg =760 torr = 14.7 psi

Multiple Choice

Which is the correct equivalency of 1 atm to torr

• 670 torr

• 14.7 torr

• 760 torr

• 101.3 torr

Multiple Choice

Which is the correct equivalency of 1 atm to psi

• 670 psi

• 14.7 psi

• 760 psi

• 101.3 psi

Multiple Choice

Which is the correct equivalency of 1 atm to kpa

• 670 kpa

• 14.7 kpa

• 760 kpa

• 101.3 kpa

GROUP UP

WORK ON EXERCISES 1-5

Draw

SHOW YOUR WORK

Temperature Unit Conversion

⦿ Conversion from Celsius to Fahrenheit:

1.8 ∙ oC + 32 = oF

⦿ Conversion from Fahrenheit to Celsius:

oF - 32 = oC

1.8

⦿ Kelvin & Celsius Conversion:

oC + 273 = K & K - 273 = oC

given

given

unknown

unknown

given

unknown

given

unknown

Examples

⦿ Convert 1200 oF to Celsius:

oC = oF - 32

1.8

oC = 1200 - 32

1.8

⦿ Convert 5730 oC to Kelvin:

K = oC + 273

K = 5730 + 273

or

⦿ Convert 38 oC to Fahrenheit:

1.8 ∙ oC + 32 = oF

1.8 ∙ 38 + 32 = oF

= 100.4 oF

GAS LAWS:

BOYLE'S LAW

​Content objective today we will understand the relationship between pressure and volume.

Language objective: So that I will be able to apply this skill when calculating pressure and volume problems.

Essential Question :I'll know I have got it when I answered: If volume of a gas is decrease with a constant temperature what happens to pressure

BELL RINGER

DESMOS

https://www.desmos.com/scientific

​Mix and match the units to their measurements.

Match

Match the following

• psi

• pressure at sea level

• K

• L

• Standard temperature

pressure

1 atm

temperature

volume

25 C

• pressure

• 1 atm

• temperature

• volume

• 25 C

Draw

Draw an example demonstrating Boyles law concept (volume is compressed pressure increases)

Draw

Draw an Line demonstrating Boyles Law

​P₁ x V₁ = P₂ x V₂

​APPLICATION

Match

Identify your variables

• Volume initial

• Pressure initial

• Volume final

• Pressure Final

5.6 L

1.5 atm

4.8 L

X

• 5.6 L

• 1.5 atm

• 4.8 L

• X

​P₁ =

V₁ =

P₂ =

V_{2 =}

​P₁ x V₁ = P₂ x V₂

​P₁ x V₁ = P₂

​ V₂

​P₁ =

V₁ =

P₂ =

V_{2 =}

​P₁ x V₁ = P₂ x V₂

​P₁ x V₁ = P₂

​ V₂

Multiple Choice

Calculate the answer using desmos

• 1.8 atm

• 2.8 atm

• 0.8 atm

• 11.2 atm

Match

Match the following

• P₁

• V₁

• P₂

• V₂

Initial pressure

Initial volume

Final pressure

Final Volume

• Initial pressure

• Initial volume

• Final pressure

• Final Volume

Multiple Choice

• 28 L

• 18 L

• 1.8 L

• 2.8 L

GAS LAWS:

CHARLE'S LAW

​Content objective today we will understand the relationship between volume and temperature.

Language objective: So that I will be able to apply this skill when calculating temperature and volume problems.

Essential Question :I'll know I have got it when I answered: If volume of a gas is decrease with a constant pressure what happens to volume?

​Volume and temperature are directly proportional

​V₁

​T₁

T₂

V₂

=

Draw

Draw the relationship between volume and temperature when pressure is constant.