How do landmasses affect air-pressure patterns?

Landmasses affect air-pressure patterns by influencing the temperature and density of the air above them. During the day, land heats up more quickly than water, creating areas of low pressure as the warm air rises. Conversely, at night, land cools faster, leading to higher pressure as the cooler air sinks. This differential heating can create localized wind patterns, such as sea breezes and land breezes, and can also affect larger weather systems by altering the distribution of high and low pressure in the atmosphere.