Environmental Physics · Field Notes
5 Things to Know About the Physics of Our Environment
24th March 2026 · 8 min read
The Energy Balance
At its core, the physics of our environment is a giant accounting problem. The sun sends energy down (shortwave radiation), and the earth tries to send that energy back out into space (longwave radiation).
For the temperature to stay steady, the energy coming in must equal the energy going out. If we add gases that trap that outgoing heat, the "checkbook" doesn't balance, and the planet warms up.
The Formula to Remember
A simplified version of the Stefan-Boltzmann Law helps us understand how much energy an object emits based on its temperature:
(Where E is energy, σ is a constant, and T is temperature. The "power of 4" means even a small increase in temperature leads to a big jump in the energy being moved around.)
The Albedo Effect
Physics tells us that different surfaces reflect light differently. This is called Albedo.
High Albedo: Bright surfaces like ice and snow reflect up to 90% of sunlight back into space.
Low Albedo: Dark surfaces like the open ocean or asphalt absorb about 90% of that energy, turning it into heat.
This creates a "feedback loop." As ice melts, it reveals darker water, which absorbs more heat, which melts more ice. It's a physical cycle that accelerates environmental shifts.
The 7% Rule
One of the most important rules in environmental physics is the Clausius-Clapeyron relationship. In simple terms: Warmer air can hold more water vapor.
Specifically, for every 1°C of warming, the atmosphere can hold about 7% more moisture. This is why we see more "rain bombs" or extreme downpours today. The air has become a bigger sponge, and when it squeezes, it pours.
+7% more moisture per 1°C of warming
The Clausius-Clapeyron relationship — the physics behind extreme rainfall events.
Heat Capacity
Water has a much higher heat capacity than land. This means it takes a lot more energy to raise the temperature of the ocean by 1°C than it does to raise the temperature of the soil.
Because of this, the oceans have absorbed over 90% of the excess heat trapped in our environment over the last few decades. They act as a massive thermal buffer, slowing down the warming we feel on land but locking that energy away in the deep sea for centuries.
The Physics of the Indian Monsoons
For anyone living in India, the most relevant piece of environmental physics is the thermal gradient that creates the monsoons.
During summer, the massive Indian landmass heats up much faster than the surrounding Indian Ocean. This creates a giant area of low pressure over the land. Because nature hates vacuum, the moist, high-pressure air over the ocean rushes in to fill the gap.
Why this matters for Indians
As the land heats up more intensely due to environmental changes, this pressure gap becomes more volatile. This physical "tug-of-war" is why we are seeing monsoons that are more unpredictable — starting later, staying longer, or arriving with much more violent force.
What We Can Do to Help
Understanding the physics is the first step towards fixing the engine. We can:
Increase Albedo: Support "cool roof" initiatives in Indian cities (painting roofs white) to reflect heat.
Protect the Sinks: Mangroves and forests act as physical barriers and carbon stores that help balance the energy checkbook.