Inches of mercury cannot be directly converted to millibars because they measure different things (pressure vs. length). You can convert inches of mercury to millibars using the conversion factor 1 inHg = 33.8639 mb, so 25.69 inHg is approximately 868.95 mb.
15w40 is thicker at all temps vs 10w30.
The .40 is a larger diameter round. The projectile has a dimension of .4005, versus the 9mm Parabellum, which has a dimension of .356. Of the two, the .40 is the more powerful cartridge.
The difference is the amount of lines of resolution. From a visual standpoint, they both look great, but if you have a TV less than 40" you won't be able to tell the difference at standard viewing distance.
.355 vs .40
$40 $40
36.2791% difference.
.30 vs. .355
yield vs ytd
no
both good
rap vs rock