SCIENCE10 Boyles Law

GOOD DAY!
GRADE 10
RECALL
SOLID
WHAT ARE THE PROPERTIES
OF GASES?
• MASS
- Amount of a gas or it’s mass (n)
• VOLUME
- Amount of space occupied by the gases (V)
• TEMPERATURE
- Measure of the hotness or coldness of an object
(T)
• PRESSURE
- The average of the forces of the colliding
molecules. (P)
Boyle’s Law
Direction: Guess the hidden word
based on the pictures given.
PRESSURE
VOLUME
BOYLE’S LAW
ROBERT BOYLE
ROBERT BOYLE
• a scientist who
made an
experiment about
the relationship of
volume and
pressure of gases at
a constant
temperature.
ROBERT BOYLE
WHAT IS BOYLE’S LAW?
Perform the Activity 1:
Marvelous Marshmallow!
• Objectives:
Determine how volume and pressure increases and decreases in Boyle’s Law.
• Materials
Syringe , rubber stopper , and marshmallow
• Procedures:
1. Remove the plunger from the syringe. Place the marshmallow inside and then reinsert the plunger.
2. Seal the syringe with the rubber stopper.
3. Increase the pressure by giving the plunger inward push.
• Guide Questions:
What happened to the size (volume) of the marshmallow when pressure was increased?
4. Decrease the pressure by slowly pulling the plunger outwards.
• Guide Questions
What happened to the size (volume) of the marshmallow upon reducing the pressure?
TWO PROPERTIES OF BOYLE’S
LAW
Boyle's law is a gas law, stating that the pressure and
volume of a gas have an inverse relationship. If volume
increases, then pressure decreases and vice versa, when
the temperature is held constant. Therefore, when the
volume is halved, the pressure is doubled; and if the
volume is doubled, the pressure is halved.
BOYLE’S LAW
EQUATION BOYLE’S LAW
• Volume and pressure of the gas can be varied let Pı
and Vı be the initial pressure and volume respectively
and Pշ and Vշ final pressure and volume.
Boyle’s Law expressed in this equation:

P1V1 = P2V2
Where;
P1= Initial Pressure
V1= Initial volume
Pշ= Final Pressure
Vշ= Final Volume
BOYLE’S LAW
SOLVING A WORD PROBLEM
In Boyle’s Law, the following formulas are to be used:
If P1 is unknown:
P1= P2V2/V1
If P2 is unknown:
P2 = P1V1/V2
If V1 is unknown:
If V1 = P2V2/P1
If V2 is unknown:
V2 = P1V1/P2
UNITS USED FOR
PRESSURE AND VOLUME
UNITS FOR PRESSURE
1. atmospheric pressure (atm)
1 atm = 760 torr = 760 mmHg
Ex. Convert 1350 torr to atm
Atm = 1350 torr/760 torr
atm = 1.78
2. torr
3. millimeter Mercury (mmHg)

UNITS FOR VOLUME
1. Liter (L)
2. millimeter (ml)
3. Cubic meter (m³)
Sample Problem
A sample of oxygen gas (O2) has a
volume of 12.0 L and pressure of 1.0
atm. What is the new pressure if the
volume is decreased to 4.0 L ?
Sample Problem
The inflated balloon that slipped from the
hand of May has a volume of 600 mL at sea
level (1.0atm) and it reached a height of
approximately 8km where the atmospheric
pressure is 0.4 atm. Assume that the
temperature is constant, compute for the
final volume of the ballon in liters.
APPLICATION OF BOYLE’S
LAW
SPRAY PAINT
• As soon as you press the sprayer and the gas starts to get out
of the container, the boiling state starts, the liquefied gas
expands and turns into gas, and the gas presses the paint
inside the container.
THE MECHANICS OF HUMAN
BREATHING
if a given amount of gas has a constant temperature,
increasing its volume decreases its pressure, and vice-
versa.
BICYCLE PUMP
• When you push down on the pump, the volume inside
the bike pump decreases, and the pressure of the air
increases so that it's pushed into the tire.
WORKING OF SYRINGE
When the cylinder on the syringe is empty, it is said to be
in a neutral state as there is no air in the syringe. As one
pulls back on the plunger, the volume in the cylinder
increases, therefore by Boyle's law, the pressure
decreases
ASSIGNMENT
A sample of nitrogen gas (N2) has a volume
of 12.0 L and a pressure of 760.0mm Hg.
When the gas is released, it gives 32.0L of
nitrogen. If the temperature is the same,
what is the new pressure of nitrogen?
QUIZ TIME!
PART I
Direction: Read the statements carefully and tell whether the statement is
TRUE or FALSE. Write TRUE in the blank before each statement if the
statement is correct and FALSE if otherwise.
_____1.According to Boyle's Law, as the volume of a gas increases,
its pressure decreases.
_____2. Boyle's Law states that at constant temperature, the product
of the pressure and volume of a gas is always constant.
_____3. Boyle's Law only applies to ideal gases under very specific
conditions.
_____4. Boyle's Law describes the relationship between the pressure
and volume of a gas when the temperature remains constant.
_____5. According to Boyle's Law, if the pressure of a gas is doubled,
its volume will also double if the temperature remains constant.
QUIZ TIME!
PART II.
MULTIPLE CHOICE: Choose the correct answer
6. Which of the following best describes Boyle's Law?
a. Pressure and volume are inversely proportional
b. Pressure and volume are directly proportional
c. Temperature and volume are directly proportional
d. Temperature and volume are inversely proportional
7. If the volume of a gas is halved while keeping the temperature
constant, what happens to the pressure?
e. It doubles
f. It halves
g. It quadruples
h. It remains the same
QUIZ TIME!
8. According to Boyle's Law, if the pressure of a gas increases, what happens to its
volume, assuming constant temperature?
a. It increases
b. It decreases
c. It remains the same
d. It varies unpredictably
9. If the pressure of a gas sample is tripled while its volume remains constant,
what must have happened to its temperature?
e. It increased
f. It decreased
g. It remained the same
h. It cannot be determined from the given information
10. Boyle's Law is applicable to which state of matter?
i. Solid only
j. Liquid only
k. Gas only
l. Solid, liquid, and gas
THANKYOU FOR LISTENING!

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GOOD DAY!

Boyle’s Law expressed in this equation:

3. millimeter Mercury (mmHg)

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