DROPLETS

Pleasing to Eyes, Small in Size;
Resembles Perl, But not Whirl;
Bear a Tear, Cause to Cheer;
Looks like Sac, Nothing to Pack;
Slip-on Leaf, Comes on Weep;
Flow toward Slope, Essential for Crop.

Let it Pour!, Spreads on Floor;
Worthless for life, Draws from Pipe.

All are set to Met, IT IS DROPLET!