H264 and AVI are two different concepts entirely, and thus can not be compared to each other. AVI is a "container", which describes only how to lay out the contents of the file, while H264 is a "codec", which describes how the video is compressed and decompressed. You could consider AVI to be a shipping container, and H264 the contents of the shipping container. Other containers include FLV and MKV. Other codecs include FFV1, H261, H262, H263, MPEG4, MJPEG, and WMV. Check Wikipedia for a comparison of common codecs. It should be noted that a file size comparison is a poor way of determining algorithm efficiency. Many codecs can be configured to provide lower quality (up to completely unwatchable) to reduce file size; to compare them fairly, make sure you're comparing each codec at the same resolution and quality.
No much smaller actually.
The scale
Hotter and dimmer. It's much smaller, but much denser.
The rocky inner planets are much smaller. That's why the giants are called giants.
it rotates quicker
it's ovisly 97%
The female flowerhorn has less variety of colors and it is much smaller compared to male.It develops a small hump compared to the male
The euglena is much smaller compared to the paramecium, its less than half the size of one paramecium.
The Canada population is much smaller compared to its land area.
Files can be compressed using a utility such as 7-Zip. This takes a file, or bunch of files and 'zips' them up into a zip file. The zip file is (usually) much smaller that the sum of its parts, and then can be e-mailed for exampe.
Humans also have a large brain compared to body size. Your species had smaller brains but your body was also much smaller.
The same quantity of a charge and the opposite sign.