Low and high pressure help
Hi, i'm studying the oxford aviation PPL books. I'm not wanting to fly or sit any exams, i have my own 737 800 pmdg setup for FSX also the FCOM, FCTM. I would like to start from the basics, so i got myself books on amazon from oxford aviation.
I can't seem to figure out pressure systems and warm/cold fronts! I'll try and explain below...
A warm front is in conjuction with low pressure as the air is less dense and rising?
Cold front is a high pressure system its more dense and air is sinking.
Now this is where i get confused, why on a hot/warm day there is high pressure as the isobars expand and low pressure its cold and dense and the isobars are closer together?
Can someone please clean this understanding up for me.
Thanks, vernon.