Which type of can bulges due to internal pressure from gas or bacterial action?

The correct answer highlights the "Springer" type of can that specifically bulges due to internal pressure, often resulting from bacterial action or gas production. This phenomenon is usually associated with the canning process, where improper sealing or contamination can lead to a build-up of gas inside the can, causing it to swell.

This swelling is a critical indicator of spoilage or unsafe food products, as it suggests that harmful bacteria may be present and producing gas as they metabolize the contents of the can. The term "Springer" denotes this particular type of issue that is frequently monitored in food safety practices.

In contrast, while "Flipper" and "Sweller" cans might indicate different issues with canning integrity or contents, they are not specifically defined by the pressure-related bulging caused by bacterial action. Understanding these distinctions is important for ensuring food safety and proper handling of canned goods.