STP/C to K/Absolute
Zero Cornell Notes
STANDARD 4 E, 4D AND
4F
MS. HAAPALA
Gases and their Properties cont…
 d. Students know the values and meanings of
standard temperature and pressure (STP).
 e. Students know how to convert between the Celsius
and Kelvin temperature scales.
 f. Students know there is no temperature lower than
0 Kelvin.
Standard 4d:
Standard Temperature and Pressure (STP)
 Standard – Because gases occupy different volumes
at different temperatures and pressures, it is
necessary to define a set of conditions that can be
considered standard.
 At STP:
The temperature is 0°C or 273 K
 The pressure is 1 atmosphere (atm) or 760 mmHg or 760
torr
 One mole of any gas occupies 22.4 L of volume (molar

volume)
Temperature Scale – Celsius, Kelvin, and Fahrenheit
What do you use
to measure
Temperature?
Thermometer
What is temperature?
 Temperature is the measurement of the average
kinetic energy – how much atoms move
 What happens to the molecules when the
temperature increases?

Answer: the molecules move faster
 What happens to the pressure when the molecules
move faster?

Answer: The collide more and increase the pressure
Standard 4e: Convert between Celsius & Kelvin
 We use a thermometer to measure temperature and
it is in either degrees Celsius or degrees Fahrenheit
we need to convert to Kelvin.
 In addition, ALL the gas laws we will be learning
must have units of KELVIN!!!
 What do you notice? ->
ºC +273 = K
Practice conversions ºC to K
 In an experiment the researcher collects the
temperature of a boiling solution. What is used to
measure the temperature?

Answer: Thermometer
 If the temperature is 155ºC, what is the resulting
temperature in Kelvin?

Answer: 155ºC +273 = 428 K
 What if the temperature needed to be 300 K. What
would the temperature be in ºC?

Answer: 300 K – 273 = 27 ºC
Standard 4f: Absolute Zero
 Learning Check:

What does temperature measure?

Answer: The average kinetic energy of atoms
 Is it possible to completely stop all the movement of the
molecules?
 The theoretical place where all the molecules would not
be moving at all is called absolute zero.
 What would the measurement in Kelvin and Celsius be at
absolute zero?

Answer: O K or -273°C
Discussion of Absolute Zero
 http://www.youtube.com/watch?v=K4sOfGKEaxs
Learning Check – Answer the following questions
 What does STP stand for?
 Answer: Standard Temperature and Pressure
 What are the 3 measurements of STP?
 Answer: The temperature is 0°C or 273 K, the pressure is 1
atmosphere (atm) or 760 mmHg or 760 torr, and 1 mole of any
gas occupies 22.4 L of volume (molar volume)
 How do you convert from degrees Celsius to Kelvin?
 Answer: °C + 273 = K
 What is the lowest temperature possible in degrees
Celsius?

Answer: -273 °C
Pressure and Volume – Boyle’s Gas Law
 http://www.chem.ufl.edu/~itl/2045/MH_sims/gas
_sim.html