OS Details

MacBook Air 2015 (11 Inch) has been launched in Early 2015.
MacBook Air 2015 (11 Inch) have OS X El Capitan

Device Size

MacBook Air 2015 screen size is 11.6 inch screen . Physical dimensions for MacBook Air 2015 (11 Inch) device is 0.11 x 11.8 INCH or ( 0.3 x 30 MM).

Displaying of Units are in this order "Height x Width"

Screen Pixel Density and CSS Pixel Ratio

"Pixel" is smallest unit/element of any display.

The total number of pixels that fit into an inch is referred to as "Screen Density" or "Pixel Density" and it measured as "Pixels Per Inch".
Pixel Desnsity have limits to display Pixels Per Inch depends on different screen sizes. When number of pixels per inch increases than it's screen-size limit, the Display resolution will increase but actual device width/height in pixels remain same. Actual device pixels are known as Device Independent Pixels or CSS Pixel Ratio.

MacBook Air 2015 (11 Inch) resolution is 1366 x 768 ^PX with ~ 135 pixel desnsity.
MacBook Air 2015 (11 Inch) viewport size is 1366 x 768 ^PX with ~ 135 actual pixel density, which means it have 1.0 mdpi display pixel density.

Is MacBook Air 2015 (11 Inch) have Retina ?

The answer is simple "No". MacBook Air 2015 (11 Inch) does not have retina.

Screen Resolution and Viewport

The sum of pixels which are displaying on a device is called as "Screen Resolution". and sum of actual pixels of any device is reffered to as "Viewport".

MacBook Air 2015 (11 Inch) have 11.6" physical screen size with IPS technology and it's native resolution is 1366 x 768 Pixels with approximately 135 PPI pixel density. MacBook Air 2015 (11 Inch) has viewport size 1366 x 768 Pixels and its pixel ratio is about 1.0.

MacBook Air 2015 (11 Inch) supports scaled lower resolutions listed below:
- 1344 x 756
- 1280 x 720
- 1152 x 720
- 1024 x 640

MacBook Air 2015 (11 Inch) supports full native resolution on the built-in display and up to 3840 x 2160 resolution on an external display.

For better understanding screen actual sizes, viewport sizes, display resolution and about their density click here.

CSS Media Queries

MacBook Air 2015 (11 Inch) Media Queries (In terms of Mobile only)

@media only screen and (min-width: 1366px) and (max-width: 767px) { /* Your Styles... */ }

MacBook Air 2015 (11 Inch) Min-Width Media Queries

@media only screen and (min-width: 1366px) { /* Your Styles... */ }

MacBook Air 2015 (11 Inch) Min-Height Media Queries

@media only screen and (min-height: 768px) { /* Your Styles... */ }

MacBook Air 2015 (11 Inch) Landscape Media Queries

@media only screen and (min-width: 768px) and (orientation: landscape) { /* Your Styles... */ }

MacBook Air 2015 (11 Inch) Portrait Media Queries

@media only screen and (min-width: 1366px) and (orientation: portrait) { /* Your Styles... */ }

MacBook Air 2015 (11 Inch) Device Width Media Queries

@media only screen and (min-device-width: 1366px) and (orientation: portrait) { /* Your Styles... */ }
@media only screen and (min-device-width: 768px) and (orientation: landscape) { /* Your Styles... */ }

MacBook Air 2015 (11 Inch) Specifications

• Launch Date Early 2015
• OS X El Capitan
• Physical Screen Size 11.6 INCH
• Resolution 1366 x 768 PX
• Viewport Size 1366 x 768 PX
• Pixel Density 135 PPI
• Device-Independent Pixels 135 PPI
• Pixel Ratio 1.0 mdpi
• Width 1366 PX
• Height 768 PX
• Device Width 1366 PX
• Device Height 768 PX
• Dimensions 0.3 x 30 cm (0.11 x 11.8 in)
• Weight 1.08 kg - 2.38 Pounds