Torricelli’s Barometer
Answer in complete sentences, so that you have a coherent paragraph
in the end!
a) A barometer is used to measure ….
b) The setup consists of …. (describe the tube and dish)
c) Atmospheric pressure … (where is the mercury going and why)
d) At higher elevation the atmospheric pressure is … (higher or
lower), therefore, the mercury inside the tube …
Changing the temperature inside a balloon
will change its volume as well as the pressure
inside.
Answer in complete sentences, so that you have a coherent paragraph
in the end!
a) Increasing the temperature inside a balloon will …. its volume
and … the pressure inside.
b) This can be explained with the kinetic theory: (explain the
connection between temperature, average kinetic energy and
movement of gas particles.)
c) Thus, increasing the temperature causes… (explain why the
particle movement increases the volume)
d) The pressure increases also, because … (explain the
connection between particle movement and pressure with
higher temperature)
Inverse and Direct: Boyle’s and Charles
P1 = 100 kPa P2 = 50 kPa
V1 = 1.0L
V2 = 2.0L
a)
b)
c)
d)
P2 = 200 kPa
V3 = 0.5 L
Boyle’s Law:
Describe how the pressure changes with volume (in
general – decrease or increase)
“If the volume is reduced to half, the pressure will ….” (be
double or half)
Describe the shape of the graph
Conclude if the relation is direct or inverse
100 kPa
V1 = 1L
T1 = 300 K
a)
b)
c)
d)
V2 = 2 L
T2 = 600 K
Charles’ Law:
Describe how the pressure changes with temperature (in
general – decrease or increase)
“If the Kelvin temperature is doubled, the pressure will
….” (be double or half)
Describe the shape of the graph
Conclude if the relation is direct or inverse
3
Pumping air into a ball
Answer in complete sentences, so that you have a coherent
paragraph in the end!
a) Pumping air into a ball will …. its mass, because…
(explain!)
b) At first all the dents will be pushed out and the volume
increases, because … (explain how particle movement
causes the change in volume).
c) After the ball is inflated, the pressure inside will …
because… (explain how more particles effect the pressure
inside).
Absolute Zero
cannot be reached
Explain in detail what
absolute zero is and also
why it cannot be reached
using the graph on the left.
Use the guidelines below:
Answer in complete sentences, so that you have a coherent
paragraph in the end!
a) When atoms or molecules are cooled down, their average
kinetic energy will … and the particles … (move faster or
slower?)
b) Eventually … (what happens at absolute zero and what
temperature is that?)
c) According to Charles’ Law, the volume also … when a gas
is cooled down. Measurements suggest that the volume would
be ….. at absolute zero. However … (explain why that is
impossible?)
d) Thus, absolute zero …. reached.
How Spray Cans Work
Push button
Outside air
(low Pressure)
Gas
propellant
(High
Pressure)
Product
Pressure-resistant curved bottom
Answer in complete sentences, so that you have a coherent paragraph
in the end!
a) A spray can consists of …. (describe all that you see).
b) When you press the nozzle, the propellant gas on top of the
liquid product … (explain how the liquid comes out at the top)
c) What happens if the inside pressure is equal to the outside
pressure? If…
d) Why do you hold the spray can for paint upside down to clean
the nozzle? If you want to clean… , because…