If a connection is leaking, what could be indicated by seeing bubbles?

Seeing bubbles when inspecting a connection is a clear indication of a leak at that connection. When there is a leak from a gas line or fitting, gas escapes and interacts with any moisture present, creating bubbles. This is commonly tested using soapy water, where bubbles form at the site of a gas leak, making it visually evident that the connection is not sealed properly.

In contrast, if the connection were functioning normally, no bubbles would form, as a properly sealed connection would restrict the escape of gas. The statement about the gas not being under high pressure does not directly correlate with the presence of bubbles, as leaks can occur at various pressures. Similarly, while air entering the system might be a result of a leak, it is not indicated by the presence of bubbles without further context regarding air pressure or system operation. The critical takeaway is that bubbles are a clear sign of a leak, necessitating immediate attention to prevent potential hazards.