Charles\'s Law. The relationship between temperature and volume. How Volume Varies With Temperature . If we place a balloon in liquid nitrogen it shrinks:. So, gases shrink if cooled. Conversely, if we heat a gas it expands (as in a hot air balloon).
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The relationship between temperature and volume
If we place a balloon in liquid nitrogen it shrinks:
So, gases shrink if cooled.
Conversely, if we heat a gas it expands (as in a hot air balloon).
Let’s take a closer look at temperature before we try to find the exact relationship of V vs. T.
Is 20 kg twice as heavy as 10 kg?Temperature scales
No. 68F (20C) is not double 50F (10C)
Yes. 44 lb (20 kg) is double 22 lb (10 kg)
What’s the difference?
62C = ? K: K=C+273 = 62 + 273 = 335 K
Absolute zero is –273C or 0 K
What is the approximate temperature for absolute zero in degrees Celsius and kelvin?
Calculate the missing temperatures
0C = _______ K 100C = _______ K
100 K = _______ C –30C = _______ K
300 K = _______ C 403 K = _______ C
25C = _______ K 0 K = _______ C
Read pages 432-3. Answer these questions:
Charles’s Law: as the temperature of a gas increases, the volume increases proportionally, provided that the pressure and amount of gas remain constant,
V1/T1 = V2/T2
Using Charles’ law: V1/T1 = V2/T2
3.5 L / 300 K = V2 / 200 K
V2 = (3.5 L/300 K) x (200 K) = 2.3 L
V1 = 1 L, T1 = 22°C = 295 K
V2 = ?, T2 = 100 °C = 373 K
V1/T1 = V2/T2,1 L / 295 K = V2 / 373 K
V2 = (1 L/295 K) x (373 K) = 1.26 L
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