Welcome To My School Study
Do You Know
1. Boiling (Bulk Phenomenon)
Boiling is the process in which a liquid changes into gas throughout the whole liquid, not just at the surface.
Key Points:
- It occurs at a fixed temperature called the boiling point
- Bubbles are formed inside the liquid
- Entire liquid takes part in the process
Difference from Evaporation:
- Boiling → happens in the whole liquid
- Evaporation → happens only at the surface
Example:
Water boiling at 100°C.
2. Unit of Power – Watt (W)
Power tells us how fast work is done or energy is used.
Formula:
Power = Work ÷ Time
SI Unit: Watt (W)
Key Points:
- Higher power means faster work
- Lower power means slower work
Example:
Electric appliances like bulbs, fans, and heaters are rated in watts.
3. Charge on Neutron – Neutral
A neutron is a particle present in the nucleus of an atom.
Charge:
- Neutron has no charge (neutral)
Comparison:
- Proton → positive
- Electron → negative
Importance:
Neutrons help keep the nucleus stable.
4. Acceleration (Types of Acceleration)
Acceleration is the change in velocity over time.
Formula:
Acceleration = Change in velocity ÷ Time
Types:
- Positive → speed increases
- Negative → speed decreases (retardation)
- Zero → no change in speed
Example:
- Car speeding up → positive acceleration
- Car slowing down → negative acceleration
- Car moving at constant speed → zero acceleration
5. Phloem (Transport of Food)
Phloem is a plant tissue that transports food made in leaves to other parts of the plant.
Key Points:
- Carries food like glucose
- Transport can happen in both directions
Difference from Xylem:
- Phloem → transports food
- Xylem → transports water and minerals
Example:
Food prepared in leaves moves to roots and stems through phloem.