- hwoyee professional huge balloon designed for meteorological investigations, aerial videos, holiday party decorations, and entertainment. - suggested inflation volume of 0.15-0.2 m³ for a 100g balloon, with a net lifting force of 160g and a total lifting force of 510g. - natural color close to white, with a neck length of ≥8cm, neck diameter of ≤4.5 cm, and body length of 75-85 cm. - ideal for fairs, aerial photos, meteorologists, science projects, and grand openings. - can be filled with more helium or hydrogen gas for greater lift near the ground, but must be filled with helium for floating. Helium can be purchased locally or filled with hydrogen in a lab (not recommended for ordinary people). the hwoyee professional weather balloon 72 inch/100g is the perfect choice for meteorological investigation, aerial video, holiday party decoration, and entertainment toys. with its impressive size and advanced features, this huge balloon is designed to meet the highest standards of performance and reliability. for meteorological purposes, the suggested inflation volume of a 100g balloon is 0.15-0.2m³, ensuring accurate data collection during scientific experiments. the net lifting force of this balloon is 160g and the total lifting force is 510g, allowing it to ascend to a remarkable altitude of 15000 m/49000 feet. whether you need to capture breathtaking aerial photos for fairs and events or conduct in-depth weather research, this balloon will exceed your expectations. featuring a natural color close to white, the hwoyee professional huge balloon is visually appealing and complements any occasion. the neck length of the balloon is at least 8cm, providing ample space for secure attachment and easy handling. the neck diameter is ≤4.5cm, ensuring a snug fit with helium or hydrogen gas cylinders. with the body length ranging between 75 to 85cm, this balloon offers a generous size for maximum visibility and impact. in addition to meteorologists and science projects, this balloon is also ideal for grand openings and holiday parties. its colossal size and vibrant presence are guaranteed to create an unforgettable visual spectacle, setting the tone for a memorable event. guests and participants will be captivated by the sight of this massive balloon soaring through the sky, generating excitement and adding a touch of grandeur to any occasion. please note that the hwoyee professional weather balloon 72 inch/100g must be filled with helium in order to float up. you can easily purchase helium locally to achieve the desired lift. however, if you wish to achieve greater lift near the ground or have access to a laboratory, you can consider filling the balloon with hydrogen gas. it is essential to exercise caution when handling hydrogen gas, as it can be dangerous and is not recommended for ordinary individuals. safety should always be a top priority when engaging in activities involving gas-filled balloons. choose the hwoyee professional weather balloon 72 inch/100g for its exceptional performance, versatility, and visual appeal. whether you are a meteorologist, event organizer, or simply looking to add a wow factor to your next gathering, this huge balloon is your go-to solution. trust in the hwoyee brand's reputation for excellence and reliability, and experience the thrill of launching this awe-inspiring balloon into the sky.