Volume represents the total amount of market trading activities on that day. It is the total number of futures contracts traded in a day, or the total number of shares changed hands in the stock market on a certain day. Futures have no order quantity, but there are positions. Open positions are the total number of open futures contracts held by all market participants at the end of the day.

Volume level measures the seriousness or urgency behind price changes. Higher turnover rate reflects higher intensity or urgency. By monitoring the level of trading volume accompanied by price behavior, technical analysts can better measure the buying and selling pressure behind the market movement.

Therefore, this information can also be used to confirm the price movement or warn that the price behavior is not credible. To put it more succinctly, the rule is that the trading volume should increase or expand in the direction of the existing price trend.