Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Investigative Science Weather PowerPoint
Document related concepts
no text concepts found
Transcript
WEATHER & CLIMATE Investigative Science Climate determines what clothes you buy. Weather determines what clothes you wear. Climate is: the long-term average of variation in weather for a particular area. Weather is: short-term variations in atmospheric phenomena that interact and affect the environment and life on Earth WEATHER VS. CLIMATE Some factors that influence weather in a particular area are: Air pressure Humidity Temperature Clouds FACTORS INFLUENCING WEATHER Air pressure is the pressure exerted on a surface by the weight of the atmosphere above it. Density of air: Near sea level, the density of air is the greatest and the pressure exerted by the air is the greatest. Why? What happens to air pressure as you go up a mountain? Or move higher away from Earth? AIR PRESSURE In the atmosphere, the temperature, pressure and density of air are related to each other. Increased temperature means the particles of air are colliding more often and with greater force---this leads to ↑ air pressure. Decreased temperature means the particles of air are not hitting each other as often—this leads to ↓ air pressure. DENSITY OF AIR Humidity is the amount of water vapor in the atmosphere at a given location on Earth’s surface. The distribution and movement of water vapor in the atmosphere plays and important role in the weather. As water evaporates into the air, it rises and when it reaches the upper part of the Troposphere, it cools and condenses into clouds. HUMIDITY Relative humidity is the amount of water vapor in a certain volume of air compared to how much water vapor that air could possibly hold. Warm air can hold more water vapor. RELATIVE HUMIDITY Clouds form when a rising air mass cools. Remember: the Troposphere cools as you get further away from Earth! Water vapor in the atmosphere cools and condenses to form water droplets. Water droplets form around condensation nuclei (small particles of dust, ice, salt or other materials). CLOUDS CLOUD FORMATION
