The following graph represents the $T-V$ curves of an ideal gas (where $T$ is the temperature and $V$ the volume) at three pressures $P_1,P_2$ and $P_3$  compared with those of Charles's law represented as dotted lines.

 

<p><span lang="EN-IN">At same temperature, curve with higher volume corresponds to lower pressure.</span></p><p><span lang="EN-IN"><span contenteditable="false"> <math> <mrow> <msub> <mrow> <mi>V</mi> </mrow> <mrow> <mn>3</mn> </mrow> </msub> <mo>&gt;</mo> <msub> <mrow> <mi>V</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msub> <mo>&gt;</mo> <msub> <mrow> <mi>V</mi> </mrow> <mrow> <mn>1</mn> </mrow> </msub> </mrow> </math> </span><br>&lt;!--- [endif]---&gt;&lt;!--- [if gte mso 9]--&gt; &lt;!-- [endif]---&gt;</span></p><p><span lang="EN-IN"><span contenteditable="false"> <math> <mrow> <mo>⇒</mo> <msub> <mrow> <mi>P</mi> </mrow> <mrow> <mn>1</mn> </mrow> </msub> <mo>&gt;</mo> <msub> <mrow> <mi>P</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msub> <mo>&gt;</mo> <msub> <mrow> <mi>P</mi> </mrow> <mrow> <mn>3</mn> </mrow> </msub> </mrow> </math> </span><br>&lt;!--- [endif]---&gt;&lt;!--- [if gte mso 9]--&gt; &lt;!-- [endif]---&gt;</span></p><p><span lang="EN-IN"> (We draw a straight line parallel to volume axis to get this)</span></p>

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