the size shape and number of resultant bloodstains will depend generally on the amount of

The size, shape, and number of resultant bloodstains generally depend on the amount of force or energy applied to the liquid blood. Factors influencing this include the height from which the blood falls, the viscosity and surface tension of the blood, the velocity at origin, the angle of impact, and the texture of the surface on which the blood lands. For example, blood drops falling straight down typically form round stains, while those moving at an angle form elongated shapes. The hardness and texture of the target surface also affect the appearance, with smooth surfaces producing more circular stains and rough surfaces causing irregular shapes and satellite spatters. Additionally, blood drying and clotting over time can alter the stain's appearance.