Volume bars are based on a given number of shares traded (volume). Each bar represents trades whose total volume is equal to the volume threshold. A new bar is created when the total volume of the current bar reaches or exceeds the volume threshold. You can create volume bar charts based on tick, second, minute, hour or daily data. For example, in a 10.000 Volume Bar chart of Google based on on-minute data, each bar's volume will be approximately equal to 10.000 and bars will be built using one-minute quotes data. Steps: - Right click on a chart then click on "Create a new periodicity" or "Periodicity settings" - Click on "Add new periodicity" then type "Volume Bar - 100000" - Select the volume bar item then set "Periodicity" type to "Volume per Bar" - Next to "Unit" field, type "100000" then click on "Save Settings" - To apply the new bar type, right click on a chart, click on "Periodicity" and then select "Volume Bar - 100000" If in the base time-frame, a bar volume exceeds "100000", then this bar cannot be split. This is why sometimes bars whose volume exceeds 100000 shares are displayed. 
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