An empty stomach.
polyps
If your organism is dead, remove the stomach and fill it with a fluid and measure the volume.
30-70 liter
a nasty little robent called a rat or mouse
Milliliters
Yes it is possible that a mouse could have 1 baby as some babys may die in the mums stomach.
The stomach's capacity is about 1 qt (0.94 liters) in an adult. Sorry though idk about a kid's
A Guinea Pig could normally be the size of a medium- potato, (equivalent as a computer mouse). But when they're bigger, as you asked, they could probably be the size of a Japanese Kokeshi doll- a little fatter and a tad longer; that's it. Hope this helps :D
when the food goes through your esophagus and it goes into your digestive system your stomach will increase from the fat
By being a voluntary bulimic with a measuring bowl
That depends on your stomach size and what foods you can tolerate better than others. I believe your question is on an individual basis.