Final answer:
The type of brine used for skating and hockey rink refrigeration systems is usually sodium chloride (E), also known as table salt. It is mixed with water to create brine, which is then used to cool the rink surface for skating and hockey.
Step-by-step explanation:
The type of brine used for skating and hockey rink refrigeration systems is usually sodium chloride (E).
Sodium chloride, also known as table salt, is commonly used to melt ice and lower the freezing point of water. It is mixed with water to create brine, which is then used to cool the rink surface for skating and hockey.
Other options such as calcium sulphate (A), calcium chloride (B), magnesium chloride (C), and calcium nitrate (D) are not typically used for this purpose.