Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Density of air
Table title:
Dry air
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Temperature T (°C) </th><th colspan=1 rowspan=1 > Speed of sound c (m/s) </th><th colspan=1 rowspan=1 > Density of air ρ (kg/m3) </th><th colspan=1 rowspan=1 > Characteristic specific acoustic impedance z0 (Pa·s/m) </th></tr>
<tr> <td colspan=1 rowspan=1 > 35 </td><td colspan=1 rowspan=1 > 351.88 </td><td colspan=1 rowspan=1 > 1.1455 </td><td colspan=1 rowspan=1 > 403.2 </td></tr>
<tr> <td colspan=1 rowspan=1 > 30 </td><td colspan=1 rowspan=1 > 349.02 </td><td colspan=1 rowspan=1 > 1.1644 </td><td colspan=1 rowspan=1 > 406.5 </td></tr>
<tr> <td colspan=1 rowspan=1 > 25 </td><td colspan=1 rowspan=1 > 346.13 </td><td colspan=1 rowspan=1 > 1.1839 </td><td colspan=1 rowspan=1 > 409.4 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 20 </td><td colspan=1 rowspan=1 > 343.21 </td><td class="highlighted"  colspan=1 rowspan=1 > 1.2041 </td><td colspan=1 rowspan=1 > 413.3 </td></tr>
<tr> <td colspan=1 rowspan=1 > 15 </td><td colspan=1 rowspan=1 > 340.27 </td><td colspan=1 rowspan=1 > 1.2250 </td><td colspan=1 rowspan=1 > 416.9 </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > 337.31 </td><td colspan=1 rowspan=1 > 1.2466 </td><td colspan=1 rowspan=1 > 420.5 </td></tr>
<tr> <td colspan=1 rowspan=1 > 5 </td><td colspan=1 rowspan=1 > 334.32 </td><td colspan=1 rowspan=1 > 1.2690 </td><td colspan=1 rowspan=1 > 424.3 </td></tr>
<tr> <td colspan=1 rowspan=1 > 0 </td><td colspan=1 rowspan=1 > 331.30 </td><td colspan=1 rowspan=1 > 1.2922 </td><td colspan=1 rowspan=1 > 428.0 </td></tr>
<tr> <td colspan=1 rowspan=1 > −5 </td><td colspan=1 rowspan=1 > 328.25 </td><td colspan=1 rowspan=1 > 1.3163 </td><td colspan=1 rowspan=1 > 432.1 </td></tr>
<tr> <td colspan=1 rowspan=1 > −10 </td><td colspan=1 rowspan=1 > 325.18 </td><td colspan=1 rowspan=1 > 1.3413 </td><td colspan=1 rowspan=1 > 436.1 </td></tr>
<tr> <td colspan=1 rowspan=1 > −15 </td><td colspan=1 rowspan=1 > 322.07 </td><td colspan=1 rowspan=1 > 1.3673 </td><td colspan=1 rowspan=1 > 440.3 </td></tr>
<tr> <td colspan=1 rowspan=1 > −20 </td><td colspan=1 rowspan=1 > 318.94 </td><td colspan=1 rowspan=1 > 1.3943 </td><td colspan=1 rowspan=1 > 444.6 </td></tr>
<tr> <td colspan=1 rowspan=1 > −25 </td><td colspan=1 rowspan=1 > 315.77 </td><td colspan=1 rowspan=1 > 1.4224 </td><td colspan=1 rowspan=1 > 449.1 </td></tr>
</table>
Question:
How's air like at 20 °C?
Answer:
At 20 °C, dry air has a density of 1.2041 kg/m³.