ThoughtCo

The Spring Equinox in the Northern Hemisphere happens on March 19 or 20 every year. During the equinoxes, both hemispheres receive the same amount of sunlight, making day and night equal. The Spring Equinox marks the start of spring, but its exact date can change every year. Depending on where you live in the Northern Hemisphere, the vernal equinox (better known as the first day of spring and also known as the spring equinox) begins every year on March 19 or 20.

Sodium hydroxide is a strong base that releases heat when mixed with water. Always add sodium hydroxide to water, not water to sodium hydroxide, to avoid dangerous splattering. Wear safety gear and use strong glassware to prevent accidents while preparing sodium hydroxide solutions. Sodium hydroxide is a common and useful strong base. Special care is required to prepare a solution of sodium hydroxide or NaOH in water because considerable heat is liberated by the exothermic reaction.

Drama is a story told through dialogue that can be performed on stage, film, or radio. Playwrights build dramatic tension to keep audiences curious about what will happen next. There are various types of drama, such as comedy, tragedy, farce, and opera, each with unique styles. In literature, a drama is the portrayal of fictional or non-fictional events through the performance of written dialog (either prose or poetry). Dramas can be performed on stage, on film, or radio.

You can print different types of periodic tables with data like melting points and electronegativity. The printable tables are available in color and black-and-white, and even blank forms for practice. Sometimes it's nice to have a paper version of the periodic table of the elements that you can refer to when working on homework problems or doing experiments in the lab. This is a collection of periodic tables that you can print and use.

Newton's First Law of Motion explains that objects stay still or keep moving unless a force stops them. Newton's Second Law of Motion shows that heavier objects need more force to move than lighter ones. Newton's Third Law of Motion says every action has an equal and opposite reaction, like pushing against a wall. Newton's Laws of Motion help us understand how objects behave when standing still; when moving, and when forces act upon them. There are three laws of motion.

Adding salt to water makes it boil at a higher temperature. Salt breaks into ions in water, which makes it harder for water to boil. More salt means more energy is needed to boil water because of stronger interactions between particles. If you add salt to water, you raise the boiling point, or the temperature at which water boils. The temperature needed to boil will increase by about 0.5 C for every 58 grams of dissolved salt per kilogram of water.

You can make a soda fountain by mixing Mentos candies with a bottle of diet soda. Create slime with easy recipes using materials commonly found at home, fun for young kids too. Make a simple lava lamp that uses safe household ingredients for a fun science project. Find an easy science project that you can do using common household materials. These easy projects are great for fun, home school science education, or for school science lab experiments.

To convert feet to inches, multiply the number of feet by 12. To convert inches to feet, divide the number of inches by 12. Unit conversions often involve unit canceling, especially when dividing by fractions. Feet (ft) and inches (in) are two units of length, most commonly used in the United States. The units find use in schools, daily life, art, and some areas of science and engineering.

San Bushman Rock Art, Sevilla Rock Art Trail, Traveller's Rest, Cederberg Mountains, Clanwilliam, Western Cape Province, South Africa. Hein von Horsten / Getty Images Bow and arrow hunting started in Africa up to 71,000 years ago, much earlier than other regions. Making bows and arrows required many tools and materials, showing early humans' resourcefulness and innovation. Bow and arrow technology offered advantages like longer range and stealth compared to lances and atlatls.

The Miranda Rights are warnings given to suspects to ensure they understand their rights during questioning. Miranda Rights tell suspects they can stay silent, speak with a lawyer, and have one provided if needed. Being arrested without Miranda Rights read is possible, but statements during questioning without them may be void. A cop points at you and says, "Read him his rights." From TV, you know this is not good.