Pilots must be aware of rapidly changing freezing levels when planning mountain flights.

Local hikers checked the snow levels before setting out for the mountain trail.

After the heavy rains, the river's water levels rose faster than the forecast predicted, forcing nearby residents to evacuate.

The carpenter packed several bubble levels into his toolbox before heading to the job site.

Rising sea levels threaten coastal communities and low-lying ecosystems.

The carpenters checked the spirit levels before installing the shelves to make sure everything was perfectly horizontal.

Scientists measured the air levels across the valley to assess pollution.

The survey team packed several Abney levels into the case before heading out to the ridge.

Before launching the outreach campaign, the team audited the contact levels for each client to tailor their messages.

In the heterostructure, differing Fermi levels across the interface led to charge redistribution and band bending.