Definition
A gas maser is a device that produces coherent electromagnetic waves through stimulated emission in a gas. Imagine it as a laser, but using microwaves instead of light. It works by exciting gas molecules to higher energy levels and then stimulating them to release energy in a controlled, amplified way. Unlike lasers, masers are typically used in specialized scientific and technological applications, like precision timekeeping and radio astronomy. Think of it as a super-precise clock or a super-sensitive ear for listening to faint signals from space. π‘ It's not something you'd find in your everyday gadgets!