What are the 3 dimensions that used in isometric sketches?

The three dimensions shown in an isometric drawing are the height, H, the length, L, and the depth, D

Explanation:

An isometric drawing of an object in presents a pictorial projection of the object in which the three dimension, views of the object's height, length, and depth, are combined in one view such that the dimensions of the isometric projection drawing are accurate and can be measured (by proportion of scale) to draw the different views of the object or by scaling, for actual construction of the object.

energy can cross the boundaries of a closed system in the form of heat and mass

explanation:

can you make it more obvious. i can't see it properly