# Conversion of energy to matter or antimatter?

1. We all know that matter converts into energy, but will energy convert into matter?

2. Does it form antimatter by converting? Illustrate me with example.

• @JoshuaLin: the short answer is yes. The longer answer is that any reaction which doesn't break the conservation laws for the force involved is allowed. The major laws involved in $\gamma \to \mu\bar{\mu}$ are conservation of lepton number and electric charge (although energy, momentum etc have a role as well). – or1426 Dec 29 '14 at 22:44