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.