Charles's Law

The relationship of which two variables are compared in Charles’s Law?

• pressure & volume

• volume & temperature

• temperature & pressure

• volume & moles (amount of gas)

Answer explanation

Charles's Law compares the relationship between volume and temperature of a gas, showing that as temperature increases, volume also increases proportionally.

What temperature scale must all temperature measurements be converted to?

• Celsius

• Fahrenheit

• Kelvin

• Does not matter

Answer explanation

All temperature measurements must be converted to Kelvin because it is the absolute temperature scale where zero represents absolute zero, the lowest possible temperature.

Volume and temperature have a ______ proportionality.

• direct

• inverse

• linear

• exponential

Answer explanation

Volume and temperature have a direct proportionality, meaning as one increases, the other also increases in a linear manner.

Which two variables must be held constant for Charles's Law to apply?

• pressure & volume

• volume & temperature

• pressure & moles (amount of gas)

• volume & moles (amount of gas)

Answer explanation

Charles's Law applies when pressure and moles (amount of gas) are held constant. Volume and moles must remain unchanged for the law to be valid.

Julian and Jimmy are playing basketball outside in 82°C weather. If they leave the ball outside and temperature drops down to 53°C, what will happen to the volume of the gas in the ball if the pressure remains constant?

• volume will remain the same

• volume will increase

• volume will decrease

• volume will double in size

Answer explanation

The volume of gas in the ball will decrease as the temperature drops from 82°C to 53°C while the pressure remains constant, according to Charles's Law.

At constant pressure, what happens to temperature of a gas when the volume doubles?

• The temperature also doubles.

• The temperature decreases to half of its original volume.

• The temperature doesn't change.

• The temperature quadruples.

Answer explanation

When the volume of a gas doubles at constant pressure, the temperature also doubles according to Charles's Law.

Edelman and Gronkowski want to play a game of beach volleyball. If the beach ball has a volume of  261 L at a temperature of 502 K, what will the temperature of the balloon be if the volume decreases to 176 L?

• 744 K

• 0.0030 K

• 339 K

• 512 K

Answer explanation

As volume decreases, temperature increases following Charles's Law. Using V1/T1 = V2/T2, we find T2 = (V2*T1)/V1 = (176*502)/261 = 339 K.

What is the formula Charles' Law?

• V = T

• VT = VT

• T₁ / V_{1 =} T₂ / V₂

• V₁ / T₁ = V₂ / T₂

Answer explanation

Charles' Law states that the ratio of the initial volume to initial temperature is equal to the ratio of the final volume to final temperature, represented by V1 / T1 = V2 / T2.

How is volume measured?

• Kpa

• mmHg

• L

• C

Answer explanation

Volume is measured in liters (L).

Records show that the incident of tire explosion is high during summer season.  Which of the following gives the best explanation for this observation?

• there are more travellers during summer vacation

• high temperature during summer season causes the air inside the tire to expand

• vehicles' tires are no well maintained

• there is too much air inside the tires

Answer explanation

High temperature during summer season causes the air inside the tire to expand, leading to tire explosions.