2 tablespoons of chia seeds measure 2 tbsp (29.6 mL) in volume and weigh 0.647 oz (18.3 g). When poured into a loose pile, they are 2.6 in (6.61 cm) wide and 1.02 in (2.58 cm) tall, which is about the size of a ping-pong ball.

In kitchen measures
2 tablespoons
6 tsp · 2 tbsp · 0.125 cups
about the size of a ping-pong ball
Chia seeds typically ranges 0.55–0.68 g/mL depending on how it's packed. A firmly packed scoop weighs more.