How Venus lose its water?

 We all know that planet Venus is the hottest planet in the solar system.

It is much hotter than Mercury which is closest to Sun. 

Venus lies in narrow virtual ring where planets can hold water in liquid state.

Billions of years ago, Venus used to have as much water as Earth is having now. 

Due to the proximity to the Sun, the sunlight is believed to have broken down the water in its atmosphere to hydrogen and oxygen.

Greater concentration of hydrogen in its atmosphere, rapidly heated up the planet.

That's how Venus is stripped out of its water.