Question

5) How is thermograph better
than a thermometer and how
can we measure the humidity in
air by the hygrometer?​

Answer 1

Answer:

Yes I think right answer

Answer 2

Answer:

$\sf\red{answer}$ Portable Document Format

Image result for full form of PDF

PDF stands for "portable document format". Essentially, the format is used when you need to save files that cannot be modified but still need to be easily shared and printed. Today almost everyone has a version of Adobe Reader or other program on their computer that can read a PDF file.