How does a fart travel to the anus?

One may wonder why fart gas travels downward toward the anus when gas has a lower density than liquids and solids, and should therefore travel upwards.
The intestine squeezes its contents toward the anus in a series of contractions, a process called peristalsis. The process is stimulated by eating, which is why we often need to poop and fart right after a meal. Peristalsis creates a zone of high pressure, forcing all intestinal contents, gas included, to move towards a region of lower pressure, which is toward the anus. Gas is more mobile than other components, and small bubbles coalesce to from larger bubbles en route to the exit. When peristalsis is not active, gas bubbles may begin to percolate upwards again, but they won't get very far due to the complicated and convoluted shape of the intestine. Furthermore, the anus is neither up nor down when a person is lying down.

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Farts and Dogs

Dogs have much stronger sense of smell than human.
Then what happened if they smell the fart?
What do you think of this question?

I experimented on my dog, John.
I expected he ran away or barked.
But his reaction was totally different.

John usually comes running to me when I come home.
He bites my hand or a bag, and jumps at me with his tail waving.
He loves me and I loves him.

On the very day, he dashed to me and bite my holdings.
I played with him some time and when his face approached
my hip, I farted.
Boo! Yes! A big one! I got it!

When he heard the sound, he got very surprised.
He stopped, and got alert for something.
As you know, he was surprised at rather the sound
than the smell of my fart.
Where does it come?
What is that sound?
I farted again.
He seriously looked around many times.

For the dogs, fart is a strange visitor.

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How much gas does a normal person pass per day?

On average, a person produces about half a liter of fart gas per day, distributed over an average of about fourteen daily farts.
Whereas it may be difficult for you to determine your daily flatus volume, you can certainly keep track of your daily numerical fart count. You might try this as a science fair project: Keep a journal of everything you eat and a count of your farts. You might make a note of the potency of their odor as well. See if you can discover a relationship between what you eat, how much you fart, and how much they smell

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