Why doesn't all gas get burped out?

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I've been wondering about this. One time I was eating a pack of bubblegum and I most probably swallowed air down with the saliva as I was chewing, but I didn't burp at all, just got horrifically bloated later. But I burp after things like carbonated drinks, or after a meal. How come that gas gets burped up, but not when I swallow air from bubblegum?

Probably has to do with the amount and forcefulness of the gas, and where it expands in your system.

You're talking about something along the lines of bubble-formations inside your stomach. Bubbles can stick to the sides and be difficult to «move to the surface» without «growing» into a bigger bubble via more air merging and attaching itself to the initial bubble. The movement of a larger bubble is easier to «drive/force to the surface» where it can then reach and enter into your esophagus/throat in order to come out and escape as a burp...

In my experience most of it goes out the other way

If you swallow air it just goes into you lungs.

Though if you swallow too much air down the wrong passage (like while you're wolfing down food too fast) it seems to be the cause of hiccups.

You dont breath carbon dioxide. So it cant be siphoned off into your lungs when you chug-a-lug a carbonated beverage. So your body expels it back out of your mouth in the form of a belch.

Thats my guess anyway.

Appreciate your replies. Sometimes I get curious of things and can't always find answers on Google.

I read a medically oriented book about curious bodily phenomena. It was very interesting because medical issues are a special interest of mine. It was a serious, well-written medically oriented volume, not a book of childish crudity played for dubious entertainment value.