How long is too long when making long straws for drinking soda? We need to know how a straw works. When you drink from a straw, you remove some of the molecules from inside the straw. This creates a pressure difference between the inside of the straw and the outside of the straw that results in the liquid being pushed up the straw. The pushing is done by molecules in the atmosphere—primarily nitrogen and oxygen. • Can You Answer This? If we had the perfect straw material and there were perfect seals between the straws, how long could the straw be? Even if the extended straw had perfect seals and rigid walls, and even if there were a perfect vacuum (the absence of all air), a straw longer than about 10.3 m (34 ft.) would not work.
Why?

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you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

no starving yourself won't it will make you lose more weight what you need to do is find out what foods make you gain weight like bread and meats with fat on