ps command and sizes

To: fedora-list@xxxxxxxxxx
Subject: ps command and sizes
From: Mauri Sahlberg <Mauri.Sahlberg@xxxxxxxxxxxxxxxx>
Date: Sun, 26 Jun 2005 18:59:31 +0300
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Hi,

Size is in kilobytes and vsize is in bytes but what is the unit of rss?
Bytes?