Bar charts are usually not suitable for display on logarithmic coordinates. Bar charts are used to represent comparisons of quantities or frequencies between different categories or groups, where the vertical axis represents the quantity or frequency and the horizontal axis represents the category or group. Logarithmic coordinates are often used to represent magnitudes or ratios of continuous variables, where the spacing between each scale is increasing at an exponential level.

In a bar graph, the vertical axis is usually used to represent quantity or frequency, while the height of the bars is relative and is used to compare differences between categories. If a bar graph is displayed on logarithmic coordinates, the height of the bars will show an exponential level of shrinkage or expansion, which will make it difficult to compare differences between categories.

However, there may be situations where it is appropriate to use logarithmic coordinates for some specific data, but this does not usually apply to bar charts in general. If your data has exponential levels of variation, you might consider using other types of charts, such as line or scatter plots in logarithmic coordinates to better visualize the data.