Final answer:
The air inside the inflated rubber tube cools down in the snowy conditions, causing a decrease in pressure which makes the tube appear underinflated due to the relationship between pressure, volume, and temperature described by the gas laws.
Step-by-step explanation:
When the rubber tube is inflated using breath, the air inside the tube warms up due to the work done during the inflation process. However, when it is then taken outside and exposed to the cold snowy environment, the air inside the tube cools down. According to the gas laws, specifically the relationship between pressure, volume, and temperature (Charles's Law), the temperature drop causes the air molecules to move slower and take up less space, resulting in decreased pressure. As a result, the tube appears underinflated because the lower pressure inside the tube allows the walls to relax and the volume to appear less.