Beijing has launched a high-temperature barbecue mode, followed by a series of rumors about "heat" - sunscreen clothes washed with water do not block the sun, heat stroke is a major heatstroke, drinking mineral water that has been exposed to sunlight in the car can cause cancer, and so on - which have been refuted in the latest scientific rumor list. The monthly "science" rumor list is jointly released by the Beijing Association of Science and Technology, the Beijing Municipal Committee Cyberspace Office, the Capital Internet Society, the Beijing Association of Science and Technology Journalists and Editors, and the Beijing regional website. Rumor has it that heat stroke is heatstroke. Some people believe that heat stroke is heatstroke and is not serious. In fact, it is not exactly the same as heatstroke, and it should not be taken lightly. Generally, heat stroke patients often have a body temperature exceeding 38 ℃, accompanied by symptoms such as facial flushing, excessive sweating, skin burning, nausea and vomiting, or cold limbs, pale complexion, decreased blood pressure, and faster pulse. Heat stroke is the most serious condition of heat related emergencies, namely "severe heatstroke". It is the most serious type of heatstroke. Once it occurs, the death rate is extremely high. Heat stroke is not a sudden occurrence. Before heat stroke develops into heat stroke, it will first experience situations such as "premonitory heat stroke" and "mild heat stroke". To prevent heat stroke, the first step is to avoid the occurrence of heat stroke. Try to avoid staying in high temperatures (high humidity) and non ventilated environments, and avoid high temperatures when traveling and take good care of sun protection. In addition, some heatstroke prevention drugs can be prepared appropriately. When having to work or engage in activities outdoors, it is important to pay attention to one's physical condition, drink plenty of water, and rest in a timely manner. If traveling by car, do not leave children and pets in the car. Pay attention to avoiding dehydration and ensure sufficient sleep. Rumor has it that sunscreen clothes become ineffective once cleaned. Is it true that sunscreen clothes cannot be washed in the water? Excessive cleaning of sunscreen clothing can indeed lead to a decrease in its UV protection performance, but normal cleaning is not a problem. Sunscreen clothing enhances the resistance of clothing to ultraviolet rays by adding ultraviolet absorbers and anti ultraviolet agents to the fabric, or by adding a sunscreen coating to the surface of the fabric, just like applying a large amount of sunscreen to the surface of the clothing. Professional sun protection clothing usually indicates the sun protection index on the hanging label, which is the result of standard testing by national professional institutions. Only when UPFgt; 40, and T (UVA) lt; Only when 5% is qualified to be called a "UV protection product" can it be called a "sunscreen garment". In general, when the cleaning frequency of sunscreen clothing is less than 30 times, the sunscreen effect will not be significantly reduced. After more than 30 times, it depends on the water resistance of the anti ultraviolet agent and the processing level of the sunscreen clothing. There are two main processes for adding ultraviolet shielding agents to clothing: one is to add them to spinning materials, and the other is to soak or coat the fabric. Generally speaking, the UV shielding agent added during spinning can better combine with the raw material, and the UV resistance performance is still considerable after multiple washes; And the UV shielding agent that only adheres to the fabric after weaving is more tolerant