Density
represent what is fluid material property in the real world
Density scale
to represent the size of your fluid
you can check this link
http://knowledge.autodesk.com/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Maya/files/GUID-EDAFBF90-5C18-4477-A820-31CCB4799BDE-htm.html
this explain a lot about fluid attribute
represent what is fluid material property in the real world
Density scale
to represent the size of your fluid
you can check this link
http://knowledge.autodesk.com/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/Maya/files/GUID-EDAFBF90-5C18-4477-A820-31CCB4799BDE-htm.html
this explain a lot about fluid attribute