圖表x,y軸問題

要視乎圖表的功用和題目提供的數據而定。

例如要畫某物在不同時間的溫度的圖表，數據如下：

時間(min) 5 10 15 20 25
溫度(oC) 20 24 25 23 20

由於畫圖表是要顯示某物溫度的轉變，所以溫度放在y軸
而時間不是未知的因素，所以放在x軸

(以上只是給你參考的例子，不表示溫度一定放在y軸)

It is a common practice in physics to put the "independent variable" on the x-axis, and the "dependent variable" on the y-axis.

For example, in a velocity-time graph (v-t graph), it is clear that the "time" is the independent variable because the velocity depends on the passage of time (but not vice versa). Hence, "time" is put on the x-axis and "velocity" on the y-axis.

In a plot of pressure against depth of water, say. The pressure depends on the depth of water, hence "depth" is expressed on the x-axis, whereas "pressure" is on the y-axis.