what is 2 5 ether to wei 
to convert eth to wei you multiply the amount by 1018 which in this case results in 2 500 000 000 000 000 000 wei the bottom linewei is the atomic smallest unit of ether on the ethereum blockchain it is equal to one quintillionth of an ether which makes transactions in wei very difficult to add for this reason there are many other unit however gwei giga or billion is the most commonly used unit because gas is charged in gwei 