Received “ VM error : revert ” while calling payable function in remix

Question

Function prototype is

    function pay1(uint xyz) payable{
    require(xyz==msg.value);
}

I set (in remix) value to 30 ether and called function with the argument 30.

Answer 1

uint xyz in the function's argument counts in wei. The msg.value should be 30 wei for that function call to work. 1 ether = 1e18 wei (pentilion)