For blood, which is mostly water, 450ml = 450 grams. Essentially the same weight. A unit of packed red blood cells weighs an average of 275mls. Or 275 grams. These measures are used to record input and output volumes on patients.
The perimeter is the length of the outline of a shape. To find the perimeter of a rectangle or square you have to add the lengths of all the four sides. x is in this case the length of the rectangle while y is the width of the rectangle. The perimeter, P, is:
Boundary is a border that encloses a space or an area. The distance around the boundary is called as 'perimeter'. The length of the three sides of a triangular field is 9 m, 5 m, and 11 m. The boundary or perimeter of the field is given as 9 m + 5 m + 11 m = 25 m.