What units are the values in /proc/partitions and /sys/dev/block/<block>/size?

I have a sample emmc block info from an android device >From /proc/partitions major minor #blocks name 179 1 5120 mmcblk0p1 Using my little intelligence I am assuming /proc/partitions uses blocks since it says partition 1 has 5120 blocks >From /sys/dev/block/179:0/mmcblk0p1/size 10240 It is seeming the partition values in /sys/…/size are double the values of /proc/partitions. Hence why are they different hence what the units in both of them?