OS Details

Samsung Galaxy Fold has been launched in September 2019.
Samsung Galaxy Fold have Android 9.0 (Pie) , upgradable to Android 10, One UI 2.1

Screen Dimensions

Samsung Galaxy Fold screen size is 7.3 inch with ~ 85.7% body ratio of actual device size. Physical dimensions for Samsung Galaxy Fold device is - INCH or ( 160.9 x 117.9 x 6.9 MM).

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

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.

Samsung Galaxy Fold resolution is 1536 x 2152 ^PX with ~ 362 pixel desnsity.
Samsung Galaxy Fold viewport size is 768 x 1076 ^PX with ~ 181 actual pixel density, which means it have 2.0 xhdpi display pixel density.

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".

Samsung Galaxy Fold have 7.3" physical screen size and its resolution is about 1536 x 2152 Pixels with approximately 362 PPI pixel density. Samsung Galaxy Fold has viewport size 768 x 1076 Pixels and its pixel ratio is about 2.0.

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

CSS Media Queries

Samsung Galaxy Fold css media queries will help developers to write styles specifically for Samsung Galaxy Fold. Here are details:

Samsung Galaxy Fold Media Queries (In terms of Mobile only)

@media only screen and (min-width: 768px) and (max-width: 767px) { /* Your Styles... */ }

Samsung Galaxy Fold Min-Width Media Queries

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

Samsung Galaxy Fold Min-Height Media Queries

@media only screen and (min-height: 1076px) { /* Your Styles... */ }

Samsung Galaxy Fold Landscape Media Queries

@media only screen and (min-width: 1076px) and (orientation: landscape) { /* Your Styles... */ }

Samsung Galaxy Fold Portrait Media Queries

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

Samsung Galaxy Fold Device Width Media Queries

@media only screen and (min-device-width: 768px) and (orientation: portrait) { /* Your Styles... */ }
@media only screen and (min-device-width: 1076px) and (orientation: landscape) { /* Your Styles... */ }

Samsung Galaxy Fold Retina Media Queries

@media
  only screen and (-webkit-min-device-pixel-ratio: 2.0),
  only screen and (   min--moz-device-pixel-ratio: 2.0),
  only screen and (     -o-min-device-pixel-ratio: 2.0/1),
  only screen and (        min-device-pixel-ratio: 2.0),
  only screen and (                min-resolution: 362dpi),
  only screen and (                min-resolution: 2.0dppx) { 
    /* Retina styles here */
}
                                

Retina is actually based upon device pixel ratio. Devices mostly have 2x or 3x display so you can use general retina media queries to display high resolution content on all kind of devices. Retina 2x and Retina 3x media queries given below:

Retina 2x Media Query (for all 2x resolution supported devices)

@media
  only screen and (-webkit-min-device-pixel-ratio: 2),
  only screen and (   min--moz-device-pixel-ratio: 2),
  only screen and (     -o-min-device-pixel-ratio: 2/1),
  only screen and (        min-device-pixel-ratio: 2),
  only screen and (                min-resolution: 192dpi),
  only screen and (                min-resolution: 2dppx) { 
    /* Retina styles here */
}
                                

Retina 3x Media Query (for all 3x resolution supported devices)

@media
  only screen and (-webkit-min-device-pixel-ratio: 3),
  only screen and (   min--moz-device-pixel-ratio: 3),
  only screen and (     -o-min-device-pixel-ratio: 3/1),
  only screen and (        min-device-pixel-ratio: 3),
  only screen and (                min-resolution: 384dpi),
  only screen and (                min-resolution: 3dppx) { 
    /* Retina styles here */
}
                                

Samsung Galaxy Fold Specifications

• Launch Date September 2019
• Android 9.0
• Physical Screen Size 7.3 INCH
• Resolution 1536 x 2152 PX
• Viewport Size 768 x 1076 PX
• Pixel Density 362 PPI
• Device-Independent Pixels 181 PPI
• Pixel Ratio 2.0 xhdpi
• Width 1536 PX
• Height 2152 PX
• Device Width 768 PX
• Device Height 1076 PX
• Dimensions 160.9 x 117.9 x 6.9 mm (- in)
• Weight 263 g - 9.28 oz