Cars, homes and factories could be powered using the air we breathe in the future, according to engineers at a special summit.

British scientists developing the technology say normal air can be used to store energy by cooling it to 190C, turning it into a liquid.

When the liquid air is later warmed, it rapidly expands into a gas, creating high pressure that can drive the piston engine of a car, or generate electricity in a turbine.

[link to news.sky.com]