When I use res.send to display the data on the client's browser, the H1 format gets applied

res.send("<h1>The temperature of London is: " + temp + " Degree Celcius</h1>");

But I would like to display multiple response and when I use res.write, the h1 format doesn't and the multiple responses all display on a single line instead of different lines.

res.write("<h1>The temperature of London is: " + temp + " Degree Celcius</h1>");

And when I have multiple res.write, everything displays on a single line instead of separate lines

res.write("<h1>The temperature of London is: " + temp + " Degree Celcius</h1>");
res.write("<h3> it is " + description +  ".</h3>");
res.write(icon);
res.send();

The result shows shows as below, not formatted and still displays the the html tags:

it is clear sky.

The temperature of London is: 14.41 Degree Celcius

Help needed please. Thanks.