Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Sony H55 and Nikon S3100 side-by-side from the front, back and top in their relative dimensions. Sony H55 has external dimensions of 103 x 58 x 29 mm (4.06 x 2.28 x 1.14″) and weighs 200 g (0.44 lb / 7.05 oz) (including batteries). Nikon S3100 has external dimensions of 94 x 58 x 18 mm (3.7 x 2.28 x 0.71″) and weighs 118 g (0.26 lb / 4.16 oz) (including batteries).
Below you can see the front-view size comparison of the Sony H55 and the Nikon S3100. Sony H55 has the same height with Nikon S3100. On the other hand, with a width of 103mm, it is 9 wider and also with a thickness of 29mm, it is 11mm thicker than Nikon S3100.
Comparison image of the Sony H55 and the Nikon S3100 Size, Weight and External Dimensions - Front View
Now lets look at the top view comparison of Sony H55 and Nikon S3100.
Top View Comparison image of the Sony H55 and the Nikon S3100 Size
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S3100 is significantly lighter (82g ) than the Sony H55 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Sony Cyber-shot DSC-H55 nor Nikon Coolpix S3100 provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Sony H55's 3.00" LCD screen is slightly larger than Nikon S3100's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.