Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Sony TX5 and Nikon D90 side-by-side from the front, back and top in their relative dimensions. Sony TX5 has external dimensions of 94 x 57 x 18 mm (3.7 x 2.24 x 0.71″) and weighs 148 g (0.33 lb / 5.22 oz) (including batteries). Nikon D90 has external dimensions of 132 x 103 x 77 mm (5.2 x 4.06 x 3.03″) and weighs 703 g (1.55 lb / 24.80 oz) (including batteries).
Below you can see the front view size comparison of Sony TX5 and Nikon D90. Sony TX5 is clearly the smaller of the two cameras. Its body is 38mm narrower, 46mm shorter and 59mm thinner than Nikon D90. As you can tell, actually this is not a fair size comparison since Sony TX5 has a built-in lens but Nikon D90 doesn't. Once you put a lens on D90, its thickness will increase significantly.
Here is the back view size comparison of Sony TX5 and Nikon D90.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Sony TX5 is significantly lighter (555g ) than the Nikon D90 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on D90, the total kit will weigh much higher.
LCD Screen Size and Features
Sony TX5 and Nikon D90's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.