negative pressure is needed for a sustained flow of water in a pipe.
The population needs to be small is the necessary condition for genetic drift to have a significant effect on populations.
The water will flow out of the cell.
to prevent the air from the atmosphere flow into potometer
A common condition analogous to the valve above the collecting duct being shut off is dehydration. Just like a shut-off valve prevents water flow, dehydration reduces the flow of urine through the collecting duct. In both cases, the result is a decrease in urinary output.
Antidiuretic hormone works against urine flow; if it's not produced, there is excess dilute urine produced.
negative pressure is needed for a sustained flow of water in a pipe.
For example, you can make an analogy with the flow of water in a tube.
For the sustained flow of charge in a wire, an analogous condition is the continuous movement of water in a pipe, where the pipe needs to be unobstructed and there must be a constant pressure or voltage difference to drive the flow. In the case of electrical current, the wire must be unbroken and there must be a continuous voltage (potential difference) provided by a source such as a battery.
The necessary condition for the sustained flow of charge in a wire is the presence of a closed circuit or path for the current to flow in. This closed path allows the charges to continuously move and circulate through the wire. Additionally, an external source of electromotive force, such as a battery or a power supply, is required to provide the energy needed to maintain the flow of charge.
A potential difference, or voltage, is necessary for a sustained flow of electric charge through a conducting medium. This potential difference creates an electric field that pushes the charges through the conductor. Without a potential difference, the charges will not move and no current will flow.
A potential difference (voltage) across the conducting medium is necessary for a sustained flow of electric charge. This potential difference creates an electric field that pushes the charges through the conductor. Without a potential difference, there would be no force to maintain the flow of charges.
A continuous source of water, such as precipitation or melting snow, is necessary for a river system to form. This water needs to flow downhill, carving a path through the landscape, which creates channels that eventually form a river system.
Negative pressure
Base flow is the portion of streamflow that comes from groundwater sources, providing a relatively consistent and sustained flow to rivers and streams during dry periods. It is important for maintaining streamflow, supporting aquatic habitats, and influencing water quality.
The only two things needed for current flow are electromotive force or voltage and a conductor. The amount of current flow will depend on the "Resistance" in the circuit.
"A flow meter is necessary when dealing with air conditioners, hot water heaters, and any other types of equipment requiring the monitoring of a water or gas flow."
A temperature difference between two objects or systems is necessary for the flow of heat. Heat flows from areas of higher temperature to areas of lower temperature until thermal equilibrium is reached.