Lei de Charles com um Balão

Medição das mudanças de volume de um gás com a temperatura

Gas Laws Beginner (Middle School) 30 min ~$5,00

Objetivo

Demonstrar a lei de Charles medindo a circunferência de um balão cheio de ar em diferentes temperaturas.

Contexto

Charles's law states that at constant pressure, the volume of a gas is directly proportional to its absolute temperature (Kelvin). By heating and cooling a balloon and measuring its size, the linear relationship between V and T can be confirmed.

Avisos de segurança

  • Handle hot water carefully
  • Do not use boiling water directly on the balloon

EPI necessário

goggles

Materiais

  • Latex balloons (3)
    Same size
  • String (1 m)
    For measuring circumference
  • Ice (1 kg)
  • Hot water (2 L)
    Various temperatures

Equipamentos

Large containers (3) Thermometer Ruler or tape measure Timer

Procedimento

1

Inflate a balloon to a moderate size and tie it off. Measure its circumference at room temperature with string.

3 min
2

Prepare three water baths: ice water (~5°C), room temperature (~22°C), and hot water (~60°C).

5 min Handle hot water carefully
3

Submerge the balloon in ice water for 5 minutes. Remove and quickly measure circumference. Record temperature.

7 min
4

Return the balloon to room temperature water for 5 minutes. Measure circumference.

7 min
5

Submerge in hot water for 5 minutes. Measure circumference. Record temperature.

7 min
6

Convert temperatures to Kelvin. Plot V (proportional to circumference³) vs T(K). Extrapolate to find absolute zero.

5 min

Resultados esperados

The balloon should be visibly smaller in ice water and larger in hot water. Plotting estimated volume vs absolute temperature should give a straight line. Extrapolating to zero volume should approximate -273°C (absolute zero).

Limpeza

Drain water baths. Pop and dispose of balloons. Clean up any spills.

Detalhes

Categoria
Gas Laws
Dificuldade
Beginner (Middle School)
Duração
30 min
Custo estimado
$5,00
Passos
6
Materiais
4

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Frequently Asked Questions

What is the objective of Lei de Charles com um Balão?
Demonstrar a lei de Charles medindo a circunferência de um balão cheio de ar em diferentes temperaturas.
How difficult is Lei de Charles com um Balão?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Lei de Charles com um Balão?
Key safety precautions include: Handle hot water carefully; Do not use boiling water directly on the balloon.
What materials are needed for Lei de Charles com um Balão?
The main materials required are: Latex balloons, String, Ice, Hot water.
What results should I expect from Lei de Charles com um Balão?
The balloon should be visibly smaller in ice water and larger in hot water. Plotting estimated volume vs absolute temperature should give a straight line. Extrapolating to zero volume should approximate -273°C (absolute zero).