Why bitcoin is votality compare to fiat money. Many say bitcoin is not a good investment because it is votality.
What is votality?
liability to change rapidly and unpredictably, especially for the worse. this is the fast price change.
Why is the votality of bitcoin high?
Bitcoin is a low supply at the time of its growing number of users and it has become a demand for the masses. Many want to buy, Many want to sell in easy-word multiple transactions. When many bitcoin transactions are fast market movements and we do not know what might happen because of the emotion of the seller and the buyer may have the price increase or decrease. So the bitcoin is votality because of the small supply and in-demand.
Why is fiat money not too volatility?
Because the government is able to regulate a traditional money, they can make new money and just increase its supply so that it does not have a votality compare to bitcoin.
Note: This is my only opinion, if you have any opinion you can also share it.
Sir, it is 'Volatility'

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I guess the volatility of bitcoin is because of the manipulation often to occurred in the market.
Peoples who own a great amount of bitcoin may able to pump or dump the price using their massive amount of coin.
I want to add masses to your comment. Whales who are in possession of large amounts of bitcoin are one side, but masses, people who have some bitcoins also affect the market changes. Today we have too many traders if you ask me, and all of them wish to earn from bitcoin price fluctuations, and when we are in situation that most of bitcoin owners sell and buy bitcoin all the time we cant expect stable price.