20 grams of pre-workout powder looks like a loose pile measuring 2.72 in (6.92 cm) wide and 1.14 in (2.9 cm) tall. To help you visualize the volume, it is about the size of a ping-pong ball.

In kitchen measures
2.46 tablespoons
7.38 tsp · 2.46 tbsp · 0.154 cups
about the size of a ping-pong ball
Pre-workout powder typically ranges 0.45–0.65 g/mL depending on how it's packed. A firmly packed scoop weighs more.