Answer: A gas is a form of matter that lacks either a defined shape or a define volume. In other words, it fills a container and takes its shape. Any form of matter that exists as a solid or liquid also takes the form of a gas. Matter changes into a gas when temperature increases and pressure decreases.
The commercial sector uses natural gas to heat buildings and water, to operate refrigeration and cooling equipment, to cook, to dry clothes, and to provide outdoor lighting. Some consumers in the commercial sector also use natural gas as a fuel in combined heat and power systems.
