7 grams of instant yeast is a small amount that measures 0.247 oz (7 g) by weight and 0.861 tbsp (12.7 mL) by volume. When poured into a loose pile, it is 1.92 in (4.88 cm) wide and 0.805 in (2.05 cm) tall, which is about the size of a grape.

In kitchen measures
2.58 teaspoons
2.58 tsp · 0.861 tbsp · 0.054 cups
about the size of a grape
Instant yeast typically ranges 0.5–0.62 g/mL depending on how it's packed. A firmly packed scoop weighs more.