A substance that turns blue litmus paper red and keeps red litmus paper red is:

a. an acid
b. a base
c. neutral
d. smelly

it can be icreased by increasing pressure.

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space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.