#mainContent p {
    font-family: Georgia, serif;
    font-size: 0.9em;
    line-height: 1.4em;
    color: #000;
    margin: 1ex 0;
}I've met this code in a project. When I got to check this on devtool of Chrome I found that margin: 1ex 0 gives the following, margin-top: 6.9328px margin-bottom: 6.9328px margin-right: 0 margin-left: 0
My question is, what equation was used to get 1ex to equal 6.9328px?
