1 tablespoon of cornstarch is a fine, powdery substance that weighs 0.261 oz (7.39 g). When poured into a loose pile, it is 2.02 in (5.13 cm) wide and 0.847 in (2.15 cm) tall, which is about the size of a grape.

In kitchen measures
3 teaspoons
3 tsp · 1 tbsp · 0.063 cups
about the size of a grape
Cornstarch typically ranges 0.47–0.55 g/mL depending on how it's packed. A firmly packed scoop weighs more.