Have you ever sat in a room and felt like the air was getting heavy? This leads to maybe you're in a crowded cafe, or perhaps you're working in a small office with the door shut tight. You can feel the heat rising, the CO2 building up, and that general sense of stagnation.
That feeling? That's your body reacting to a closed system.
In physics, biology, and even business management, we talk about systems all the time. But most people use these terms loosely. They throw "open" and "closed" around like they're interchangeable, but if you get them mixed up, you’re going to run into trouble—whether you're trying to pass a thermodynamics exam or trying to scale a startup Worth keeping that in mind..
What Is an Open System
Let's strip away the textbook jargon for a second. It could be a cell, a solar panel, a country, or a coffee machine. At its simplest, a system is just a collection of things working together. The distinction between "open" and "closed" comes down to one thing: boundaries Small thing, real impact..
The Flow of Energy and Matter
When we talk about an open system, we’re talking about something that interacts with its environment. It’s not isolated. It’s constantly exchanging both energy and matter with whatever is surrounding it.
Think about a campfire. Plus, a campfire is a classic open system. Because of that, it needs oxygen (matter) from the air to keep burning, and it releases heat and smoke (energy and matter) back into the atmosphere. In real terms, if you put a lid on it that prevents air from entering, the fire goes out. It’s constantly "talking" to the world around it.
The Concept of Isolation
On the flip side, a closed system is much more antisocial. In a truly closed system, energy can move in and out, but matter cannot Easy to understand, harder to ignore..
Wait, that sounds a bit confusing, right? Let's clarify. In a strictly scientific sense, a closed system allows heat or light to pass through its boundaries, but it doesn't let physical stuff—like gas, liquid, or solids—escape or enter.
A great example is a sealed glass jar containing a plant. Sunlight (energy) can pass through the glass to reach the plant, but the dirt, the water, and the air inside the jar stay inside. The matter is trapped.
The Theoretical "Isolated" System
Now, if you want to get really technical, there is a third category: the isolated system. An isolated system allows nothing to pass through—no energy, no matter. This is the "hermit" of the science world. In the real world, a perfectly isolated system is almost impossible to find. Even the universe itself is often debated as being an isolated system, but for most practical purposes, we deal with open and closed.
Not obvious, but once you see it — you'll see it everywhere Not complicated — just consistent..
Why It Matters / Why People Care
Why should you care about these distinctions? Because understanding how systems interact is the key to understanding how the world works That's the part that actually makes a difference..
If you treat an open system like a closed one, you’re going to fail.
In biology, if a cell's membrane fails to regulate what enters and exits, the cell dies. That's why in business, if a company acts like a closed system—ignoring market trends, customer feedback, and new technologies—it eventually becomes obsolete. It can't take in nutrients or expel waste. It stops "breathing" with the market.
Understanding these boundaries helps us predict outcomes. Think about it: if I know a system is closed, I know that the total amount of matter inside stays constant. I can use math to predict exactly what will happen over time. If the system is open, the math gets much more complicated because I have to account for everything coming in and everything going out.
How It Works
To really grasp this, we need to look at how these systems behave in different environments. It's not just about "on" or "off"; it's about the rate of exchange.
Dynamics of Open Systems
Open systems are inherently dynamic. Because they are constantly receiving new inputs and shedding outputs, they are often in a state of flux. They are prone to change, growth, and even chaos.
In an open system, you have to monitor the input-output ratio. If you're running a restaurant, your "inputs" are ingredients, staff, and electricity. Your "outputs" are meals, waste, and revenue. If your inputs don't match your outputs, the system breaks down. The system is constantly adjusting to its environment to maintain a state of equilibrium That's the part that actually makes a difference..
Stability in Closed Systems
Closed systems are much more predictable. Because the matter is fixed, you are essentially dealing with a finite set of variables It's one of those things that adds up..
In a closed system, you're mostly looking at how energy changes the state of the matter inside. Think of a pressure cooker. In practice, the amount of water and food inside stays the same, but as you add heat (energy), the pressure and temperature change. You can predict the outcome because the "stuff" inside isn't going anywhere.
The Role of Entropy
Here is where it gets interesting. There is a concept called entropy, which is basically a measure of disorder Most people skip this — try not to. Less friction, more output..
In a closed system, entropy tends to increase over time. Everything naturally moves toward a state of maximum disorder. If you leave a closed box of mixed colored marbles alone for a billion years, they won't magically sort themselves by color; they'll just get more disorganized Still holds up..
Easier said than done, but still worth knowing And that's really what it comes down to..
But open systems can fight entropy. A living organism is an open system that uses energy (food/sunlight) to fight off entropy and maintain a highly organized structure. Because they can pull in energy from the outside, they can create order. This is the fundamental miracle of life Most people skip this — try not to..
Common Mistakes / What Most People Get Wrong
I see this all the time in academic discussions and even in professional strategy meetings. People use these terms as metaphors without actually understanding the mechanics That alone is useful..
Mistaking a "limited" system for a "closed" system. Just because something has a limited amount of resources doesn't mean it's a closed system. A bank account with a fixed amount of money is a closed system in terms of matter (the cash), but it's an open system in terms of energy (the interest and transactions). People often confuse "finite resources" with "closed boundaries."
Ignoring the "hidden" inputs. In business or social sciences, people often treat a department or a team as a closed system. They think, "We have our budget, our people, and our goals; we're good." But they forget the external inputs—the culture of the company, the pressure from competitors, or the changing regulations. If you ignore the external inputs, you aren't managing a system; you're just hoping for the best No workaround needed..
The "Perfectly Closed" Fallacy. People often assume they can create a closed system. You might think a sealed container is closed, but if it's not perfectly airtight, it's actually an open system. In practice, almost everything we interact with is an open system. Trying to treat it as closed is a recipe for unexpected results.
Practical Tips / What Actually Works
If you want to use this knowledge to actually improve your life or your work, here is how you apply it.
- Audit your inputs. If you feel stuck or stagnant (the "heavy air" feeling), ask yourself: What inputs am I missing? Do I need more information? More energy? More diverse perspectives? If you're acting like a closed system, you're cutting yourself off from the very things that drive growth.
- Identify the boundaries. Before you try to solve a problem, define the system. Are you dealing with a closed system where you only need to manage energy/effort? Or is it an open system where you need to account for external variables? Don't try to solve a problem in an open system by using the rules of a closed one.
- Watch the entropy. If you notice things getting messy, disorganized, or inefficient, check your energy flow. In any system—a project, a household, or a company—you need a constant influx of energy to maintain order. If the energy stops flowing, the disorder takes over.
- Use "Closed" thinking for precision. When you need to be highly controlled and predictable (like in a lab or a specific financial model), try to minimize external variables. The closer you can get to a closed system, the more certain your
predictions become. But remember: you are paying a high "energy cost" to maintain that isolation. Use it strategically, not as a default way of living.
- Design for "Open" resilience. Since true closed systems are theoretical ideals, build your life and your organizations to expect disturbance. Create feedback loops that tell you when the environment has shifted. Keep slack in your resources—time, money, mental bandwidth—so that when the inevitable external input arrives (a market crash, a health scare, a disruptive technology), you can absorb it and reorganize rather than shatter.
The Final Distinction
The universe itself is the only true closed system we know of—a finite amount of energy and matter, expanding into nothing, winding down toward heat death. Everything inside it—your business, your body, your relationships, your mind—is an open subsystem. We are all eddies in the stream, temporary patterns maintained only by the constant flow of energy passing through us.
The official docs gloss over this. That's a mistake Simple, but easy to overlook..
Understanding the difference between closed and open systems isn't just physics trivia. It is a lens for competence.
When you treat an open system as closed, you get fragility. You get the manager who ignores the market shift until the company folds. You get the intellectual who stops reading because they "know enough." You get the person who isolates themselves to avoid pain and finds they have only avoided growth.
When you treat a closed system as open, you get waste. Because of that, you get the engineer adding redundant safety factors to a sealed pressure vessel, increasing cost and weight for a variable that doesn't exist. You get the micromanager trying to control variables that are already fixed by the laws of thermodynamics Still holds up..
The master practitioner knows which game they are playing. They seal the vessel when precision is critical and the variables are known. They open the hatches when adaptation is required and the environment is shifting Easy to understand, harder to ignore. Turns out it matters..
Entropy is the tax on existence. In an open system, you pay it daily—but in return, you get to keep the lights on, the structure standing, and the pattern alive. Worth adding: in a closed system, you pay it once, and the account eventually zeros out. The choice isn't between order and chaos; it's between a slow, guaranteed fade and a high-maintenance, high-reward dance with the unknown That's the part that actually makes a difference. And it works..
Choose the dance. Day to day, keep the boundaries permeable. Keep the energy flowing.
