Because they absorb moisture from the air, causing them to become slightly moist.
No matter how long I leave out saltines, they only become harder; i thought
they would become softer. I have dental problems and need soft crackers.
One crispy food that will be become soft when left in the open and only retain their crispiness when kept in airtight tins are crackers.
Biscuit contains high content of Starch, bread do not, Starch is humidity sensitive and attract humidity from air. Biscuit made with starch to be able to absorb liquids in it, bread do not. Hope this will help, Thanks for asking.
Moisture from the air
Bread, if left out for too long, will become stale. This happens for 2 reasons. One, if the bread was hot, it would be softer. As it cools, the crust will harden. Otherwise, air causes the soft-ness of the bread to deplete. The air can dry out the bread, cool it off, harden the crust, take the moisture out, and possibly cause it to grow mold (if you leave it for TOO long). Some cookies / crackers will do the same. Others will become mushy. This happens as the bonds within the cookie / cracker that made it crunchy or firm begin to loosen. As moisture seeps into a cookie / cracker, that bond will also weaken and it will become softer with time.
Because its cold outside and it deflats
If left sitting out of the package long enough to become soft, if they are old to become stale, or if they become damp or soggy, chips will lost their chop.
Air has moisture in it. The food picks up that moisture and becomes soft. By placing the food in an air-tight tin, you have limited the amount of moisture that is available to soften the food, so it stays crispier longer.lol
Biscuit contains high content of Starch, bread do not, Starch is humidity sensitive and attract humidity from air. Biscuit made with starch to be able to absorb liquids in it, bread do not. Hope this will help, Thanks for asking.
When a biscuit is left for a while it becomes soft but when a cake is left for a whileit becomes hard.Jaffa cakes become hard, which means they're really cakes!
Soft animal parts usually rot and do not become fossilized.
when you sing you want to use your stomach and you want to open your soft pallet like when you want to yawn that is when you open your soft pallet.
your teeth is making it soft