What's the effect of inert gas for the energy-saving function of insulated glass?

The inert gas in insulated glass compared to air, the density, thermal conductivity is small, it can slow down the middle layer of thermal convection, reducing the thermal conductivity of gas, thereby reducing the heat transfer coefficient of insulating glass, help to improve the insulating glass of the insulation performance and energy saving effect. 
Argon is the most commonly used inert gas for filling the spacer layer of insulating glass, which is relatively easy to be extracted and the price is lower. 
Hollow glass filled with inert gas 

Hollow glass is filled with inert gas filling, can increase the glass thermal insulation function, which has energy-saving advantages are compared to the hollow glass that with not the inert gas filled glass, to achieve the following effect: 
Winter heat can be retained indoors 
The heat is blocked outdoors in the summer 
Energy-saving insulation 
After filled with gas, can reduce the pressure difference between inside and outside, to maintain balance of pressure, reducing the pressure caused by the glass burst. Filled with argon, can effectively improve the insulating glass K value and can achieve following results: 
Thereby reducing the condensation of the glass inside the room 
Improve the comfort level 
After filled with gas hollow glass is less prone to condensation and frost 
Observation the outside world clearly 

As argon gas as inert gas has its own characteristics can slow down the hollow glass thermal convection, but also can greatly improve the effect of noise reduction, so better insulation insulating glass with argon gas. 
Improve the sound insulation effect 
Because filled gas is a dry inert gas, the air inside the hollow glass cavity can be replaced by air, so the environment inside the cavity is kept dry and the service life of the molecular sieve in the aluminum interval frame can be prolonged. 
Standard for inert glass filled with inert Gas 
There is not specified for inert gas filled with hollow glass, but in general, not less than 90%.

Source from http://www.sggglassmanufacturer.com