What should the consistency of a properly blended milkshake have throughout?

The key to a properly blended milkshake is its viscosity, which refers to the thickness or resistance to flow of the liquid. A well-prepared milkshake should have a smooth, creamy consistency that allows it to be sipped through a straw and enjoyed without being overly thin or excessively thick. The ideal viscosity enables the milkshake to hold its shape while still being easily drinkable, providing a satisfying experience without requiring much effort to consume.

Hydration refers to the water content within a product, which is important for texture but does not specifically address the blend consistency of a milkshake. Density relates to mass per unit volume, which can influence how a milkshake feels but is not directly an indicator of how it should be blended. Sweetness, while a critical flavor component of a milkshake, does not pertain to the texture or consistency of the blend itself. Therefore, viscosity is the most relevant characteristic when assessing the quality of a milkshake's consistency.