Can we mount /var with tmpfs instead of device:/dev/xvda3

As I'm new to linux I'm not sure whether we can mount /var with tmpfs instead of raw device..

Please confirm..

# df -hP

df: `/pthy4i/udump': Stale file handle

Filesystem                                                 Size  Used Avail Use% Mounted on

/dev/xvda1                                                 2.0G  781M  1.1G  42% /

tmpfs                                                       32G  4.0K   32G   1% /dev/shm

/dev/xvda7                                                 988M  3.3M  917M   1% /home

/dev/xvda5                                                 3.9G  8.0M  3.7G   1% /oem

tmpfs                                                      4.0G  650M  3.4G  16% /tmp

/dev/xvda2                                                 4.8G  2.4G  2.2G  53% /usr

/dev/xvda3                                                 2.9G  343M  2.4G  13% /var  <<<===

]# grep tmpfs /etc/fstab

tmpfs                                              /tmp                 tmpfs      defaults,size=4g,mode=1777,nosuid,nodev 0 0

tmpfs                                              /dev/shm             tmpfs      defaults             0 0

You have new mail in /var/spool/mail/root