What is the percentage of agar required to prepared a solid medium?

1-2%

Agar is typically used in a final concentration of 1-2% for solidifying culture media. Smaller quantities (0.05-0.5%) are used in media for motility studies (0.5% w/v) and for growth of anaerobes (0.1%) and microaerophiles.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

i don't know. if i were you, i would search it up online : d