15 grams of flaky sea salt is 0.529 oz (15 g) in weight and has a volume of 2.25 tbsp (33.3 mL). When poured into a loose pile, it is about the size of a ping-pong ball, measuring 2.58 in (6.56 cm) wide and 1.16 in (2.96 cm) tall.

In kitchen measures
2.25 tablespoons
6.76 tsp · 2.25 tbsp · 0.141 cups
about the size of a ping-pong ball
Flaky sea salt typically ranges 0.3–0.6 g/mL depending on how it's packed. A firmly packed scoop weighs more.